hi d.f.
my symptoms also presented after having the flu. had ptosis for 2 years off and on, treated/misdiagnosed as other things. after the flu i had difficulty chewing, swallowing, lifting above the shoulder and holding my head up. apparently stressors like illness can unmask symptoms. talking to others here, this is a fairly common thing.
if you're having trouble with the dosage on your mestinon, talk to your neuro about half pills. they do make a 30 mg. but no one seems to stock it. my neuro originally wanted me to start on 30 mg. but i just got 60 mg. and a pill cutter. turns out i need much more, 90mg. every 4 hours, religiously. this dose keeps me almost symptom free.