Hi, ibeeanurse. First, you were very lucky to get a diagnosis. Most neurologists will rule out MG when everything is normal, without going to the SFEMG. You were very fortunate in your neuro. I wish I had a power chair for those really bad days. Mostly I cope by watching my activity, using a cane on bad days, and using the electric carts available in many stores.
You probably need to start with your neuro. Talk to him about getting a power chair, and see if he will prescribe one for you. Then talk to your insurance company and see what you have to go through to get it.
Hope you get one!
Hugs,