Yah you know I am seriously wondering if my fibro isn't totally Hypokalemia because that is a total description of what I have been experiencing for 5 years.

tingling,Light headedness,fatigue,muscle aches. and ESPECIALLY
deep muscle fatigue and cramping. That is EXACTLy on the mark for me. My legs have been the biggest problem and I am hoping and praying it is as simple as low blood potassium. If potassium takes care of it wouldn't that be great for lots of us!!!!!!!!!!!

Hope it helps you ,Debbie.