<s>[INST] I have very sudden loss of muscle control and cramping in my forearms. I used to be a gymnast and very athletic. I am no longer a high level athlete or even close. I know that cramps are due to low potassium- however it seems more extreme. I struggle to regain composure for at least a 60 sec interval- I bend over and am struck by the pain and complete loss of control by my hands and arms. I can recover up to 30 min or more I have lost all fine motor motor skills in my fingers as it takes minutes to go back to normal. Please tell me if this can be a symptom of MS? Also my eyesight is dramatically decreasing... [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. It could be MS but that is not a typical finding. It sounds more like a problem with the nerves in the neck. The vision loss may or may not be related. You need an exam, X-rays and probably an MRI to sort this out. Regards. </s>