hi steve,,i understand how much it hurts
but you should realise that all the electrolytes(calcium,magnesium,sodium,potassium etc) ,elements vitamins etc which are vital for life and every metabolism
and function of whhole body systems can have bad effects if taken in excess..magnesium deficiency
may be one of many reasons for muscle weakness
but not all muscle cramps
weakness are due to mg deficiency...so the treatment should be evidence based and scientific..
consult physician ,get investigated,blood tests ,,,dr will prescribe what is best remedy for you..bye bet well soon