Anacrusis, Why are you taking a sedative? Everyone gets weaker on one.
I've never gotten weaker after an antibiotic. Which ones make you weaker?
Altitude does not make me weaker, it only makes me more unable to breathe well.
As far as "periods of weakness," MG is highly unpredictable and I just go with the flow instead of trying to figure it out ahead of time.
That's my 2 cents.
Annie