Thinking back.....what is your primary issue? Are you depressed as a result of anxiety or are you anxious as a result of depression?

If you're depressed as a result of anxiety, I just say no wonder you went hypomanic while on an antidepressant. You need anxiety meds and not antidepressants. You don't need more and more and more meds in order to control side effects from the meds you're already taking.

Maybe start coming off the meds one by one. Start exploring medications that attack your anxiety.

Your seratonin levels may be normal. What happens when you give someone with normal seratonin levels a drug that boosts seratonin even further? Yep, they go hypomanic. It may just mean that this class of drugs is not for you.