I recently was diagnosed with PoTS. I was put on Metroprolol. I have been on it for maybe a week and a half, all of a sudden I started getting confused and feeling out of it and now I'm just constantly crying. My vision has gone blurry. It also causes my feet such as toes and nails to turn blue. They took me off one medicine before going on Metroprolol because it turned my toes/nails blue as well. Is this a side effect? Because the confusion is making me have panic attacks because I'm scared.