Hey all I haven't posted in awhile because I was doing better. I had my b12 retested and my thyroid rechecked. I found out the results Monday. I've had heart palpitations start back here recently. I have started to exercise more (4miles a day 3x last week) not sure if this is the cause of it or my beta blocker isn't working well? I've been on the beta blocker four months. Same as shots. I don't believe it's potassium I keep my food and drink intake at 4-6mg per day.