Abby, Within the few months before my MG crisis, I had episodes like what you're describing. The worst one came just a day before it when I thought I would stop breathing altogether. It could simply be that your MG is being pushed to its limits. There could be some other factor but you should see it as a warning sign to SLOW DOWN.
There are a LOT of articles about NMJ fatigue. Here are a few for you.
I hope the increased treatment helps. Hang in there and take it easier.
Annie
The best one, which has a free PDF:
http://physrev.physiology.org/content/88/1/287.long
Another PDF, which is more about general fatigue:
http://www.cfids-cab.org/cfs-inform/...ri.behan04.pdf
Other articles:
http://www.ncbi.nlm.nih.gov/pubmed/8585479
http://www.ncbi.nlm.nih.gov/pubmed/11461153