Hi
Welcome to the forum
Well some people can start a rapid eye movement without any cause or underlying disease. Sometimes brain’s control over eye movements is weak. Very high near sightedness and/or far sightedness can also cause this. Brain tumors, neurological disorders, scar in retina optic nerve can all cause this. Caffeine can be a contributing factor and so can caffeine withdrawal. In your case the nystagmus (REM) could be without any cause or due to caffeine withdrawal if you have stopped it suddenly. With time this should settle down.
Headache, red itchy watery eyes, REM movements can be present together in ocular migraines or retinal migraines. Cataract and glaucoma too should be ruled out. Also get your vision tested.
It is very difficult to determine the exact cause of your symptoms on net. Please consult a neurologist and an eye specialist.
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