I got the Pfizer shot --not so much for me (I exercise and watch my diet), but to "do my part" to help protect others --especially the elderly who seem to be freaked-out beyond comprehension because all they do is watch CNN all day. I had a reaction that lasted for TWO weeks. Off and on dizziness, headaches, extreme exhaustion, and sore joints and muscles. After 12 days I went to the doctor. Said the same thing... "You may have been exposed to Covid in the past, seems you have a supercharged immune system and don't get the second shot". Did complete blood work up and everything looked good.