Need Help With Understanding The Effect Of Glutathione On Headaches

Hi I m a 22 year old female. I ve had head pressure at the back of head, which most of the time turn to headaches for seven years now. I took glutathione in January to April 2011. The head pressure disappeared a few hours after taking glutathione and I didn t have the head pressure and headaches until I stopped taking it. Unfortunately, my derma, who s selling glutathione and who s importing them from abroad, ran out of stock in May. Glutathione in drug stores didn t work just like my derma s gluta. The head pressure and headaches are now back. They sometimes climax. I can feel head palpitations. Had a CT Scan but the result was negative. The neurologist whom I talked to said that it is migraine. Will try MRI. May I ask anyone who could provide answers regarding the connection of the headpressure/headaches with glutathione? I also don t think that it s tension headache because the muscles in the nape and shoulder are not painful.