Your questions are important. There are no long-term studies on the medication I use. There is nothing crazy about having such questions. What is unfortunate is that most mental health professionals do not recognize that these questions are to be expected. A recovery oriented system would have detox centers and other supports available so that people could plan a rational withdrawal from medications in order to explore these important questions.
Most psychiatrists are too busy for our own good.
We would be wrong to assume that most psychiatrists have a thorough knowledge of their clients' treatment history. In an age of managed care psychiatrists have less and less time to spend with more and more clients. Many psychiatrists have never read the full case record of the people they prescribe medications to. Even fewer could identify all of the various drugs and drug combinations that you have tried over the years and what the outcomes of those drug trials were. In light of this I have found it important to begin to keep my own record of what medications I have tried, for what symptoms, at what dosages, and for what period of time.