I am afraid what happened to you four years ago but which you have since denied (not taking medicine, not wanting further social security, etc.) is not going to be considered anymore, no matter who writes up the paperwork. That this other person said, at that time, you were not able and wanted you to find another career and you were fired from your job, etc. is not about your now/recent situation so I don't see how any paperwork will work on it now. For all anyone knows, you could work at that same career (just not that company), you could work full time, etc.; that you have not done any of those things based on this person who has not been treating you and does not appear to have treated you well and that you have refused treatment by them, etc. will probably negate things.

I would start again, fresh with someone, no revisit such a mess as arose from this past situation. It does not sound like you will get any more help from the psychiatrist and it does not sound like the GP will write up something about something he is not part of/does not "know". That you are anxious, etc. is "normal" based on your situation, whether you can work or not is not really known anymore? I would look for a job, part-time or full-time in the field of your choice, that you think you can get and try working and going to a doctor at the same time and then see what the current situation is and have the current doctor who will know you and your situation, deal with disability problems if they arise.