Here is an excellent overview of antidepressant withdrawal, which generally applies to all psychiatric drug withdrawal. The transcript for the video is here https://thedrugclassroom.com/video/antidepressant-withdrawal/
Here are some topics that may answer your questions. Tapering - what you need to know
History of the black box warning on antidepressants about "discontinuation syndrome"
Click on the links and add to these topics if you