I've been suffering from headaches now and every pain medication i take, the headache goes away but then comes back. this has been coming on for a while since i went off the pill, i'm not pregnant, i have unnormal menstrual cycle,what could this be?

Could be time...: Time to see the doctor. Headaches can be from a number of things, including migraines (triggered by something), viral infections (flu, etc...), sinus congestion (sinusitis, allergies, etc...), stress (tense muscles or neck, etc...), meds or other "drugs" (drug withdrawal, caffeine effects, etc...), hormonal changes, blood sugar changes, fumes (smoke, carbon monoxide, etc...), rare tumors, etc...