My husband has been suffering with headaches everyday for a number of years . He has done numerous tests including MRI's and CAT scan and nothing has shown up on them. I am wondering if this is normal and is there any treatment for his pain.  The doctors keep prescribing medications that do not work and he is convinced that no one can disgnose his problem.Can you please offer some suggestion? what can he do because the pain is sometimes very intense.

Thanks.