I know this is going to sound stupid but maybe you should keep a journal about this.

What if it's not the Mestinon per say but that the Mestinon is "revealing" something else going on. Like maybe - if you have Grave's ophthalmology - it is making that worse.

http://discoverysedge.mayo.edu/de08-4-endo-bahn/

http://www.mayoclinic.org/medicalpro...athy-2010.html

Be careful. Mestinon's effects have been shown to last for a couple of weeks. And when Mestinon wears off, you could have more "corneal drying" which could hurt the eye. Kind of like when you have too much acetylcholine, you have tearing (as in tears). Just a thought.

I think checking with a neuro-ophthalmologist or an endocrinologist might be a good idea.

Annie