I have a-fib and a usually low heart rate....low 50s. I am on BP meds, and blood thinner. I have had a heart ablation and everything went fine for about a month when the a-fib started up again. Doctors put me on a 21 day heart monitor, but I don t have the results yet. The past few days I have been having a tightness in my chest, but not severe....otherwise feel fine. I check my BP and it has been varying greatly. Heart rate (during no exercise) has flipped from 36 to 105, with nome 70s and 50s in between. The bp has been normal, but occasionally the lower # has been in the low 100s. I am 75. Should I be worrying about this?