I am on no carb no sugar diet because of candida for 10 days.for 4 days now all my muscles are really sore,i can barely walk or lift arms.is it normal?

Acidic changes : Being no carb changes you to a ketogenic acid metabolism. Basically, your body systems become more acid. I wonder if your muscles have reacted to this. There is a rare condition called MELAS or another mitochondiral disease which the acidic environment effects muscles. Other conditions that cause muscle inflammation are possible. You should see a doctor.