Hand curling into fist on its own

Im on day 31 of my water fast. Today my right hand went numb and started tingling. i know that happens sometimes during fasts but then my fingers started moving on their own and my hand started curling up into a fist and i couldnt control it. it only lasted for a couple of minutes but even after it stopped it took all the energy i had just to get my fingers to straighten out. i dont know if this is normal because i have never done a Water Fast this long. i really want to make it to 40 days but im worried this could be a sign of something more serious. Tweet