I agree completely with mrsD about keeping a journal. You have been treated by many different docs for your MG - which puts even more responsibility on you to keep great records.

Re: your strength....perhaps you hadn't worked out for a few a days prior (because you had been feeling so weak) to your strong days. I encourage you to keep a schedule of you workouts versus your strong/weak days. I'm not suggesting you eliminate work outs...but rather, learn how to best integrate them into your life to try to help limit MG peaks and valleys.