I am not sure what's wrong with you and why you are happy but unhappy?! but if I would have to guess - it's most likely antidepressants/therapy. There is new "you" but you miss old "you". Brain chemistry is no joke and if you don't absolutely absolutely need medication don't do it. Ask good doctors for second, third and fourth opinions if needed.
If anything OP was worse off before they started treatment. Changing or getting off meds could be a valid choice but all the changes seem to have lead OP to a generally better life
