Panic attacks from raising dosage of concerta?

I was taking concerta for a few months. I had unpleasant side effects for a while but then it's gone. My psychiatrist raised dosage and I didn't feel strong side effects, as if my brain got used. In 21th of February my psychiatrist raised dosage to from 30 mg (something about that) to 45 mg. Now I started feeling weird sometimes, as if I'm overdosed. I already had panic attack once and sometimes I feel my heartbeat is high and I have tremor. So I'm curious could it be adjusting or there is something wrong with dosage or I'm being stressed from something?