I Have Had Tingling Down My Neck And Left Arm

I have had tingling down my neck and left arm on and off for about three weeks. When I lay in bed to go to sleep I may start to feel tingling down from my left shoulder when I more my neck the tingling goes away. They is no pain associated with the tingling I am a diabetic. When I check my pulse I feel I am missing a heart beat from time to time. 10 pulses then a missed pulse. 4 pulses then a missed pulse My pulse rate is currently at 98 beats per minute. I have taken two 81 mg asprin. I am a BLS CPR/AED instructor. I teach the signs of stroke and heart attack to people every day. I am 52 and weight 261Lbs. Please give advise.