I get a lot of extra heartbeats, etc, seemingly caused by hypertension and mild Lvh. I've just had a period of 2-3 weeks of "normal", eg, my heart rate has been up in the 60s-70s, blood pressure good and I haven't felt many extra heart beats, just the odd one or two where it's generally many times a day. Honestly, I've felt great. Now, last couple of days, heart rate dropped back to 47-52 and got the passing out sensations back. Also yesterday my heart rate suddenly started beating really fast for several seconds, on 3 separate occasions while sat at my desk working. One of the times I thought I was going to pass out and felt like my face swelled up and hot. Checked my blood pressure at night and it was fine. What's going on? Could my BP suddenly go up causing this and then go back to normal?