I have a diagnosis of Blepharospasm for my eyes, though the blinking doesn't cause any pain. But I have also had cramp like pains in my right arm, and the pain was pretty severe for 6 weeks. But once I took Mestinon the pains in the arm went away, and the spasms in the eyelid have slowed by more than 50%.

I don't know how or why it happens but yes MG can cause pain.
Cold hands and feet. Are they actually cold or do they just feel cold to you. I have often felt that my hands were cold, but other people said they were warm to the touch and when I had an EMG done, they wanted the skin temp up to 32C, they were surprised to see that my resting skin temp was 31C although I felt cold.