If you have not recenty had your eyesight tested I suggest you try that first (including checking the suitability of any glasses/lenses you wear). The symtoms can be the result of tiredness and may be related to the sort of work/activity you engage in (close-up, concentrated attention ?). Migraine is often used as a catch-all diagnosis and the starting point for lots of medication - it is possible there is some very simple explanation. Three days is a very short time - observe for weeks at least, recording activity together with timing and severity of the symptoms. Are you better at weekends ?