I'm 75 and walk and work out too. Had an ablation 19 mos. ago which seems to be holding. Am on Eliquis, Metoprolol, and Losartan. All I can say is I guess meds affect people differently. Decades ago I was put on Metoprolol and all I wanted to do was stay in bed, or jump out the window! I stopped it after one day. Now, it doesn't seem to bother me. Maybe the dosage was different. This probably hasn't been a lot of help, but hang in there, and good luck! Oh, I also stopped drinking.