I feel like it depends on what the headache is caused by (stress, hunger, environment, etc.) but try eating something или take a nap или relaxing in a quiet environment. Nothing is going to work super fast and even pills take a couple hours
There are several things Ты can do for a head ache: 1. Try taking a nap - in a cool dark room. (Stay out of the bright sun light.) 2. Use a cold compress. If Ты feel your head throbbing and или your neck and shoulders aching - try using an muscle ointment (I know Ты сказал(-а) no medicine) или something to relieve the stress. If Ты do not have any muscle ointments - try using some hand cream and massage your neck and shoulders. 3. I find eating something - not necessarily a big meal - if Ты are not allergic to Peanuts - try a couple of spoonful of арахис масло, сливочное масло - I'm not sure if this helps me because there is something in Peanuts или it is just a comfort Еда for me. 4. If Ты are feeling stressed try to do something that gets your mind off of your problems.