No, there is no connection with MG (that I know of). There are many causes: smoking, overuse of nasal sprays, sinus polyps, allergies, and for some odd reason, loss of sense of smell often precedes (sometimes by a long time) Parkinson's disease. I'd say it'd be worth a visit with an ENT to try and pin down a treatable cause. Another doc appt, yay!

My mom has no sense of smell, and has been that way for nearly 30 years. I also have a neighbor that lost hers.