Hopeful that therapy will help

Yes, that sounds like a textbook clinical depression to me. Not to be confused with 'I feel depressed because I am sad'.

I've had two severe clinical depression episodes in my life. That was before ssri etc became available here. It got so bad that it was, and I kid you not, a major physical effort to get out of bed in the morning and brush my teeth. It was exhausting. Physically. Eventually I cottoned on to what was happening and made a plan.

Dont try to be the oak that stands straight and tall in the storm and breaks, be the willow and bend with it and ride it out.
Avoid any kind of stress. Every molehill looked line an unsurmountable mountain range to me. I rang the tax people and said
"I am sorry, I am really sick, I can't do the return this month, and possibly not next month". They were cool about it.
I reduced my work load to next to nothing. I had to feed my dogs once a day. I had to move my cattle to new pasture once a week.
That was it.
I had to get up and brush my teeth. I had to cook one hot meal a day for myself - those were my demands of myself, and nothing else.
After 4-6 weeks this became successful. One day, after shlepping home from shifting cattle I noticed that the grass was green, that
my steps were lighter. I started to regain my energy. Some light exercise, in my case light physical work, became helpful rather than a drain.

But that is my story, and it's just not practical for most people. People in employment have bosses, tasks, obligations, schedules.
In your circumstances I think you need to see a physician first, and get some meds. That should give you enough of a lift, energy wise, that you can maintain your daily life.
Apart from the maintenance (going to work, paying the bills, feeding your body)destress as much as you can. Stress is the worst thing for deepening depression, and vice versa, the deeper the depression gets, the harder it gets to deal with the stress. Medication definitely can
give you a leg up here. Just --- in my opinion, don't get hooked on the stuff.
Also be aware: depression puts thoughts of suicide into your head. It is a symptom. It is not you who wants to kill yourself - it is a symptom of depression and why should you listen? Kick that thought out of your head when it crops up - that is not YOU thinking it.
Prozac for one has been observed to increase the risk of suicide. Maybe because it gives really depressed people just enough energy to go through with it - that is one thought. I seriously don't know why - I am behind in following that discussion.
Another nasty symptom is the wish to totally cut yourself off from other people. Don't give in to that, because, again, that will only make it worse. Ask friends for help - tell them you're ill with this, could they do a grocery run for you, or help you move that furniture for you.
You have to make it clear to them that in your current frame of mind, they absolutely must not make demands of you, because that would only make things worse. "man up" "get over it" "go for a run" etc etc are not helpful in this situation, and if the person does not understand that, then maybe it's better not to have them on your case for a bit. But someone who turns up voluntarily with a bowl of chicken soup is ... chicken soup for the injured soul.

Talk therapy sadly does not seem to help much with depression. But a good therapist can help you manage the symptoms, and give you strategies of coping, and hopefully getting past it. It is not permanent for everybody. It may well be only a brief episode in your life. Roll of the dice, I guess.

All the best, P.

notlookingback, having had severe depression, I can give a few tips. The most important thing to remember is this - depression lies. It tells you can't when you can. It says you have never been happy and you never will. Telling that damn voice to shut up might be the hardest thing you do, but you have to. This is a disease that can kill. Suicide can take many forms, and only a few are conscious.
You may be sick of talking about it, but you have to. If there are support groups in your area, use them. When I was a teenager, I went on a depressive rant, telling everyone how terrible I was. My mother sat down and told me about how she suffered from postpartum depression after the birth of my third sister. I realized I wasn't alone, and I got help.
Give your medicine time. It normally takes most anti-depressants 45 days to fully work. Feel free to talk about the side effects. For me, Prozac worked well, but Zoloft did not. That is surprising, as they are very similar medicines. Don't be surprised if the medicine affects your libido. If that's an issue, talk to your doctor to adjust it.
I realize this is hard. In fact, it's a marathon. So like a marathon runner, pace yourself. There will be times you must allow yourself to either sleep or cry.
Finally, accept life on life's terms. Many of us have unrealistic expectations, and we feel we fail when we don't meet them. If you find yourself feeling resentful or in a bout of self-pity, sing along with Frozen and let it go. You will be fine. Trust me.

notlookingback, two months is nothing. You are still grieving, and not at all ready to be thinking about dating or moving on.

I hate this term moving on because it's usually said as soon as some horrible event occurs without even giving people time to grieve their loss. I believe this is what you are experiencing now...loss...and the accompanying grief and depression. I think you are expecting far too much of yourself at this early stage. Feeling what you feel is normal considering what happened. It's been one-year for me, and although I'm doing better, I still get depressed and have great moments of despair, and I know others who are post SM do too.

Please give yourself time to go through the grieving and healing process, and it is a process.

Hugs.