Taking carvedilol to slow heart rate down. 3. 125 mg?

I take the exact meds and MG. I take 2 a day 12 hours apart. My Dr. wanted to increase the dose to twice the MG. Wow, big time crash and side effects. Returned back to 3.125 twice daily with much less side effects. My system I am told is very reactive to medications, so I get baby dosed. I even have to print on my forehead that I am a "light weight" so the anesthesia doctor knows I have severe reactions to being put under. I have been on the medications for three years now. Symptoms still persist and have altered my life. Dizzy, and great fatigue, along with body muscle and joint pain are a major issue. I even had some other doctors think it was Fibromyalgia. Actually is is a typical side effect of all the symptoms side effect that mimic Fibromyalgia symptoms. I also have had vision issues, kidney issues, and migraine that leads me to the ER. Still doctors will not fully admit that on this very low does that such symptoms are possible. Yet my many trips and several days in CCU prove there is a issue yet not pinpointed. Bottom line, some of us out here are very sensitive to Coreg/Carvedilol and the symptoms manifest quickly with dose increase and manifest even at the low levels of 3.125 MG.