YES, YES, YES..... At least for me speech is very much effected, slurred and or nasal sounding.
We had a man in town years ago that got arrested for DWI but he wasn't drunk, it was his MG, the police officer thought his slurred speech was caused from him drinking but as we MGers know our speech is indeed effected.
I just got in from my Neuro and while speaking to him he held up his hand and said stop, your voice is weakening.
I know that MG is scary but in time you will adjust and hopefully find the treatment that will work for you.
Big Hugs

and feel free to ask anything you want even if it sounds silly, we all do it.