I applied for four jobs today, including GitHub. I feel kinda proud of myself.

I am Done! I am extremely burnt out and unhappy with my work. I have been doing this professionally for over 5 years now and much longer than that unprofessionally.
This new company I joined finally gave me the salary I always dreamt of but now I am extremely unhappy and depressed and anxious all the time. And I don't like the work I am doing. I don't like the team. I hate being isolated at home for over 2 years, working from home. I had a mental breakdown in the middle of the meeting the other day. And after that, I said. that's it. I am done. So, I gave the resignation letter. I don't know what I am gonna do. But I sure as hell can't do this shit any longer. But now, the fucking hr is making it even more difficult for me by not letting me leave without serving the notice period. I told her I am on fucking medication and I am having severe mental health issues. Now, she wants to see the medical certificate. Or I have to pay two months' salary. WTF? If I had that kind of money lying around, I wouldn't have slaved myself away at your shitty company, would I?
I went to my psychiatrist whom I have been seeing consulting for the last couple of years now. I asked for a medical certificate and he thinks it'll hamper my future career. So, he said I should get a certificate from a general physician. So, that's the world we live in then? You can't even speak the truth? And the way HR is behaving over the mail makes me feel like a total slave. I mean I am not at all fit for work these days, and it feels like, if she had her way, she would tie me down to a chair and ask me to push out code. what the fucking fuck. This is some fucked up industry and I think I am finally done with software development. But now, I don't have any idea what I am gonna do with my life or how am I gonna earn money. I am so burnt out and anxious that even the thought of working again gives me panic attacks. even working from home. What the fuck do I do?