Hi chaos,
You have a diagnosis of MG correct? From my limited understanding of MG muscle weakness is common. Muscle weakness could very possibly be part of the problem with you falling/almost falling. Have you spoken to the Doctor that treats your MG? If not that might be a good idea
http://www.ninds.nih.gov/disorders/m...nia_gravis.htm
http://www.mayoclinic.com/health/mya...CTION=symptoms