I haven't had a diagnoses yet - started looking into it when my child was diagnosed and I said I didn't understand what about this assessment told them that they were autistic and they said I probably am too if I see all the reasons for diagnoses as "normal" behaviours.
I feel like 5 years ago I was very similar to yourself. Actually finding out there could be autism in me has greatly improved my quality of life which is why I haven't pushed for a diagnoses as if they said I don't have it then I worry it would undo all the good work I have done.
I think someone was right when they said about the routine of just showing up. I'm now higher management in my job. And literally we make accommodations for everyone.
Literally, even when I'm in agony (I have severe endo) I just turn up and let everyone know I'm having a pain day and so I help out where I can or do paperwork. Or find mindless cleaning tasks in which I can sit down. And worst case? I go home. The key is just to go regardless and you'll find the more you immerse yourself the more you will get used to the routine.
The same when I have days in which I can't bare people I put myself somewhere isolating. Usually there's no problem with that because most people want to be around people.
But literally just getting up and going is key. I've had to take 6 weeks off just now because of a personal issue and that's messed me up as I can't take longer that 10 days off work at a time without it making me fall back into the mindset you are in but I had a chat with a coworker and it's pepped me up a bit for going back.
Agoraphobia is very much in the mind. And it's so easy to sit here and tell you that but it's also that easy to push yourself out of it if you push yourself into mind over matter. I find actually gaslighting yourself, actively combating the bad thoughts. I do it rationally, like if I can't go out because x,y or z happens then I figure out the probability of that actually happening. Equally getting back into the world is hard because it's a huge change and to most people it doesn't sound like it but it is. I got a dog to help because I couldn't not take the dog out. I also love and wanted a dog. This has now backfired because I now work full time and am out the extra expense of having things in place for her 😂 I truly thought I wouldn't ever be able to work more than part time.
But truly 5 years ago, I was just like how you've described and I done a lot of mental work. I would say go with what feels right. No one therapy will work so take what works and forget the rest. I do a mixture of so many things!
I was on UC and PIP for a physical health issue and last year when my review came up I couldn't even reapply because truly I don't need it although the condition is still there.
I thought I'd never own my own home or have a career and I would just be as I was forever. But literally in 5 years my whole life has changed! I just need to learn how to drive and I think I will be winning at life.
It's almost like a game, especially for work. You find out the rules and go for it.
Good luck, you can change your life if you chose to! Mind over matter is the key!