A Pilot's viewpoint only.
Firstly, I'm sure that eye exercise is of some benefit, but I'm equally sure that it's not very great. The cilia-like suspension of the lens works in the opposite sense to the way most people think it should. Correction for poor near vision is like trying to push a piece of string.
Doctor thinks its physcological but i am sure there is a physical sensation of throbing intermitantly once or twice a day...
Muscular spasms do tend to enter into a cyclic or diurnal pattern.
I wrote a lot about pain in the Extra Ocular muscles, and have just finished on another thread saying how bad Valium is, but I used it to test my theory that my E O muscles were causing weeks of pain. They were, and once I knew what it was, they stopped doing it. Often the mind work like that with spasms.
Taking just 2 or 3 tablets from the doctor, used only as a diagnostic tool, will ensure that your not tempted to take more.
http://www.pprune.org/medical-health...ml#post2523979
http://www.pprune.org/medical-health...ml#post1939228