Thanks all, I've gone out and investigated some things thanks to your tips and suggestions. Reading up on Bell's palsy, it seems unlikely since it's just my eye, not the entire right side of my face.

I had been suffering double vision on and off for a few years, and even had one incident of ptosis for a weekend (never went to hospital - ah to be young and fearless again) before I experienced some arm weakness and fatigue. Everything was very transient though. Probably had active MG for about 4 years before being diagnosed in March.

All that to say that I think my eyes are still my major symptomatic area and given my genetic predisposition for heavy lids, I may just be stuck with an almost half closed eye.