Hi! What is the cause of sudden painful muscle spasms on my sides, from below my armpit/ side of breast and then lower to the hips. Not on my back, occasionally in the front of my abdomin. I take potassium and drink at least 60 oz of water a day. These spasms come out of nowhere, seize up in so much pain i almost scream, and only subside after extensive stretching. Thanks! Sorry, I though ght this was a free service, thanks anyway