Hi Nicky,
I never know when my speech will be become affected. I had a bout with speech a few years ago, before my MG diagnosis. I also have Lupus or something in the Lupus family and the Docs thought it was from that. A lot of guessing with all fo this. But since my MG diagnosis and my taking mestinon, most of the time my speech is OK until I overuse my mouth or just get too tired. My talking for a living days are almost over. Then we'll see what comes next!