These sound like all of the symptoms i have when my electrolytes go out of balance due to drinking too much water or doing a colonic....exactly.
You should get them tested...........this can be dangerous....if you want to learn more.....the best sites i have found are put up by people with race horses........yes....thats right......after a race...the horse loses a lot of sodium or potassium....from sweating....and they have vet top up the elctrolytes after every race...to make sure the horse doesn'r cramp up.....potassium controls muscle contraction...a lot of flushing the system is the same as a ot of sweating....body builders and lomg distnace runners etc.....also watch their lytes..........