Toprol-XL and charley horses

I am taking Toprol XL for HBP. My legs have been cramping very badly during the night sometimes (Charley Horses). Now my doctor sent me for a doppler and they say it showed abnormal wave forms in both legs. Now they want me to do an angiogram which I am quite reluctant to do. These cramps didn't come on until I had been taking this medicine for a few months. My BP however had gone down, lower than the doctor remembers seeing it. I had blood work done earlier in the spring and everything on it was in normal range.

I was healthy until I went to the doctor. Now it seems I am on the way "out" of the world.