I had terrible cramps in my feet, legs and hands for months. I think it was lactic acid
from their being little oxygen my blood.
I don't have the cramps now, but have severely weak, sore and painful legs muscles. I also have started with a tingling on my face about a weak ago. I suspect a new lotion I was using, but, I also started having headaches more frequently. I don't know, it's probaby a coincidence, but, when I saw your symtoms, it caught my eye. Good luck and post your results.