Yes the antidepressants can trigger mania which would cause a mixed state. The antipsychotics will help. I didn’t want to take medication either, I had been med free for about 5 years and I was proud of not needing meds. I was already in a mixed state when I was put on an antidepressant which just ramped it up a hundred times. They finally got me stabilised and I’m not happy taking the meds but I’m scared of going back to mixed state cos it really was the worst. So I keep taking them. Do you have the option to see another psych? Maybe you just didn’t get the right one first time