I will talk with my therapist about this too.
Never heard of it, but, it certainly sounds like what I've felt like since loss of parents in 2013.
But, the anxiety has subsided some.
And, yes, since I've been staying inside so much due to the pandemic,
I've gotten the same way. No ambition.
I make myself do useful things everyday, but, it is like an effort.
The more I isolate, the more I want to. Think I could sleep all day.
I'm going to give the same advice that I always try to give, when it comes to this sort of thing.
Three aspects to it:
1. Just doing the work... or forcing yourself to do the work... isnt going to solve a problem like that. You're merely forcing yourself to go from a dreary state into something that is, in itself, inherently dreary, but in a different way. It's as if you decided that the best way to overcome the unpleasant feelings of being stuck in the house was to go outside during a particularly slimy and unpleasant rain storm.
You need more than just that. As I always say, the mind needs something to really occupy it. Something positive, not something brain-meltingly dull. Try a hobby instead. Get into something new that is going to fire up your enthusiasm, and that will add more variety to your daily life. Something that gets the ol' brain cells excited.
This sort of idea is important even in normal times, but it's even more important now, with the pandemic causing everyone to be stuck inside alot. But the good thing is, the technology to pursue such things even despite that now exists, and getting the tools necessary to do any given hobby is as simple as merely accessing the internet and using, I dunno, Amazon or something.
Simply staying stuck in a rut is just inherently bad for you. That is a fact. Creating alternatives to that rut, thusly, can only help.
2. Drink lots of water. LOTS. No, I dont care if you dont enjoy doing it. Bloody well do it anyway. Dehydration has both massive physical *and* psychological effects. It drains your energy, but it also drains your mood and mental state. Worse, we usually dont realize when we are dehydrated. Even worse, we tend to substitute other liquids for that water and think that somehow it magically does what water does (spoiler, it doesnt).
I cant even describe to you how much of a difference this one makes. You have to experience it for yourself.
3. Do you drink? At all? If you do.... dump it. The alcohol. ALL of it. Every... last... bit. It is very literally a depressant. It produces only the *illusion* of positive effects, while in reality it makes you slower, dumber, clumsier, and more depressed. Those are, very literally, its effects. Even if you do find some solutions that CAN help your mood, help you get out of that rut... alcohol will utterly cancel those beneficial effects. I say this as someone who has been forced to watch it happen a million times over, transforming happy, brilliant people into unhappy drones that just sort of slog through the day, with them then always wondering why they have to be like that. It is not a fun thing to observe. My mother and stepfather both went through this ridiculous transormation, and it only reversed when my patience with it finally snapped and I essentially screamed at them for 10 minutes about it. Turns out I can be incredibly loud when needed. That was not fun either, but the necessity of it was just one of the many problems that alcohol provides. I dont drink even a single drop myself, never have, yet I still had to deal with the effects it produces. That, too, is something to keep in mind.
And as for those first two points, well, I say those as someone who went through it. I've been where you are now. After a massive anxiety attack... one of the worst I've ever had, and the result of all of that crushing unpleasantness bearing down on me for too long... family members stepped in to sort of force me out of that rut. Bringing real variety into my life... variety that could excite and enthuse the mind... was what did it, and the water drinking sealed the deal.
Every time I give this advice I rather expect nobody to listen, but dagnabit that wont stop me from trying. I'm bloody stubborn that way.