Myasthenia Gravis and Muscle Cramping

I'm still new to the myasthenia gravis diagnosis and need some advice, please. I've been taking pyridostigmine for a few months. Over time, I've noticed some muscle cramping, but nothing too severe. This has changed! Last night I woke up with severe leg cramps in my thigh and calf on one leg and my thigh on the other. It was debilitating and scary. I'm wondering if this is a symptoms of MG or if it is a side effect of the pyridostigmine? Either way, are there any home remedies? Last night I drank a bunch of water, walked around the house, and tried some heat. Eventually, things calmed down enough that I was able to get back to bed. However, I still feel twinges of cramping today in both legs and, also, in my flank.

What can I do to 1) prevent this and 2) treat it if it continues? I'm wondering about electrolytes? Gatorade, Pedialyte, or something like that. I know there are so many things I'm not supposed to take with this diagnosis and don't want to get myself in even more trouble by taking something I shouldn't. BTW, I'm between doctors right now or I would be on the phone with my doctor about this. I would gratefully appreciate any and all advice you have to offer.