I was put on Toprol xl (GENERIC) 3months ago. Its been a nightmar...

I was put on Toprol xl (GENERIC) 3months ago. Its been a nightmare. I was put on it for rapid heartbeat. My blood pressure was great 110/70 sometimes lower. I was happy with it for about 2 or3 weeks.Its been all down hill since. Sleepless nights, horrible sweats, leg cramps from my knees down, cold hands and feet. And horrible headaches. It was at the point i didn't want to get up. Called my doctor and he said to stop taking it.Today is my second day without it and last night i finally slept all night first time in 3 months. Woke up with no headache and i haven't had any sweats. I see my doctor tom. I am not going back on. I don't think its the medicine for me.