Hi, pain behind eyelids is very broad term to pinpoint to one diagnosis and treat you accordingly.  I would advise you to get an eye checkup done by an ophthalmologist for revision of your glasses number, check eye pressure and to look for dry eyes. As of now can give warm water compression 3 times a day to both eyes which will reduce your fatigue and give some relief. Wear glasses regularly and not just often as may be the refractive error is a cause for your eye pain.

How much eye sight you have? When was your last visit to an ophthalmologist? How many hour's do you wear your spectacles/glasses? Any other associated symptoms along with it? Further history is needed and It has to be evaluated futher.