My girlfriend has been to numerous doctors. she has headaches but without sensitivity to light or sound. she also gets dizzy from bending or lying down too fast. what couldbe the reason?

ENT?: Has your girlfriend been to an ENT specialist? The dizziness may be to a sinus infection or an inner ear issue. There could be a tmj/tmd component, but i would want to know the potential cause, duration, and a thorough history.

Headache specialist: She should find a headache specialist, a neurologist specializing in headaches. The dizziness is a blood pressure issue. Make sure she drinks plenty of fluids and that her blood pressure is controlled.

Vertigo: If by getting dizzy you mean the room spins around, then she should also be evaluated by an ent. She might have benign positional vertigo (bpv). This can be a symptom that is not related to the headaches. The good news is if she does have bpv, it usually easily treated.