Am I alive??

I went spinning today. It was the first time in about two weeks due to my illness. I just couldn't breathe. I got there right on time and got all ready to go. I put on my heart rate monitor and started riding. We were doing some work on endurance so we were supposed to keep our heart rates pretty even at 75-85%. So, I was watching it and my heart rate kept jumping from like 30% to 87% or so. So, I was like...ok this is really weird. Then, all of a sudden...it went to 0. And, me...being me....actually felt my neck to see if I had a pulse. Just makin' sure. So, basicly I think I need new batteries or something in my monitor. After that...I took it off and just enjoyed myself.