Hi, Catie, welcome to the forum. I'm also in the process of getting diagnosed, and Mestinon has helped my double vision a lot. That doesn't mean much, though--I've only been taking it a short time, and who knows what's in store for me in the future. I hope it works for you.

I just wanted to emphasize what DesertFlower said about too much Mestinon. When I tried taking it every three hours, it was too much and it made me really weak! What constitutes "too much" is different for everyone, so just be aware. Best wishes for a quick diagnosis and successful treatment.