Toprol-XL and second pregnancy

W Female Age:29
i began having high blood pressure just before my second pregnancy 3 1/2 years ago. I have been on Toprol for over 2 years straight to today. I had tried several different medicines that could not control my blood pressure after he was born. Toprol XL 50 mg x 2 daily was the only one that seemed to work, but i do have the side effects. I have had several instances of panic attacks with feeling of dying. By the time i could be seen at the hospital it had already subsided. The doctors have not been able to give any indication as to the reason for these attacks other than it was a panic attack and have prescribed Zanax. I have experienced the heavy left arm with chest pain, the dizziness and nausea along with ringing in the ears. I am now changing cardiologists and will try new medications to rid of the side effects. Again, the medicine has done its purpose, but the side effects are begging to take their toll.