Those initial doses sound high to me (but I'm no expert). The fact that four psychiatrists put or kept you on those doses--I can understand why you trusted the decision, having had it reinforced multiple times.
It's great that you found professionals at a mental health clinic who agreed to help you off the medications; unfortunate that they did not know that one must go S-L-O-W-L-Y down that path.
Now that we know to go slow, however, there is another opportunity to do it right. The important thing now, it seems to me, is to get you at helpful levels of the drug(s), whatever that may be, and stabilized for an appropriate period of time before you attempt a slow withdrawal process.
If you have not already received a caring pharmacist's opinion, you might inquire about possible drug interactions of all your medications--unless your psychiatric nurse is qualified in that regard. Then again, a second opinion is often worthwhile. The pharmacist I consulted happens to own an independent pharmacy that is not part of a chain, though I am sure valued pharmacists can be found at both.
You once wrote "I wish peace for everyone who suffers. It increasingly seems to me that is everyone." Indeed. My grandmother, at 103 and unhappy in the nursing home in which my aunt had placed her, said to me, "I don't know why I'm still here." I suggested she might have something yet to learn or, more likely, more to teach others. We all learn from each other's experiences on here, and I thank you for sharing yours. I look forward to learning from your progress, and wish you the peace and happiness you deserve--which you so graciously wish others.