Am I on too much medication? And what do I do about this when my doctors won't listen to me?

I'm currently seeking treatment at an outpatient program at a hospital for mental health. Before I went to this program, I was seeing a nurse practitioner who had me on 20 mg Celexa, 300 mg Lamictal, 10 mg Abilify, 30 mg Buspar, and 500 mcg Vitamin B-12. I entered the outpatient program because I needed to see someone immediately, because I was at my last straw. My meds weren't controlling my mood or anxiety, and I was experiencing dizziness, drowsiness and nausea every day and was even missing work because of all these problems. NOW I have a new doc at the hospital and she kept me on all these same meds PLUS 900 mg of gabapentin. Now, all of my side effects are worse, and in addition I have an extremely fast heartbeat and have almost past out numerous times, and can't even drive much now because of all this. I don't know what to do. I have told my doc and counselor at the hospital about my concerns with the amount of meds I was on before. But now it's worse. I guess, I should also share that I wasn't going to take the gabapentin, but after I almost aulted my neighbor this past weekend I decided to take it and continue treatment there. All these pills are helping my mood and anxiety, but they're slowly killing me at the same time.