Hi Melanie, sorry you're experiencing such painful cramps. HAve the doctor given you anything for it? Perhaps you can check with them. I used to have painful cramps, but mine's not diagosed as MG so I'm not quite sure if it happens to people with MG. I'm currently taking clonozepam for the spasticity and also cramps that I have. It seems to be working, but I have to take the maximum dosage for it to work. Lol.... I'm not sure if its good for people with MG to take it though...