I am a 46 year old female with no real medical problems. I was woken in the middle of the night with a horrible charley horse in my left calf that lasted for a total of 8 minutes. I get these horrible spasms from time to time but nothing like this one. Once I jumped up and started rubbing the spasm I broke out into an all over body sweat and I felt sick to my stomach like I was going to vomit or pass out. Any thoughts from anyone? Someone told me they think it is metabolic acidosis because I do eat a very low carb diet. Not sure if that is the cause though.