Mu first question would be about the Prozac. Did they use that to treat anxiety or his ADHD? We also had good success with Prozac for my sons anxiety (in that it really targeted his anxiety well), but we had some bad side effects and had to stop. However, we are on different medication for his ADHD (we have yet to find one that really works well as he metabolizes them very quickly). Maybe he needs both the prozac and something that combats his anxiety? I would reach out for another opinion.
We have tried multiple medications over the past few years, some have worked for a while and then not worked and some have not worked at all. It is so tricky with medications and he is so young which makes it so hard because you can’t quite get his opinion on it (if that makes sense?). Good luck…I totally have been (and sometimes feel) exactly where you are now.