My migraine I believe are weather related. I have "that feeling" when I wake up that I can't describe but that I know I will have the excruciating pain of a migraine . I was given Sumatriptan 100mg to take.This was by my primary physician. I have yet to go to a neurologist. My doctor said if you take it and it works then you know your headaches are migraines. I was diagnosed with migraine last year by my ENT. I always thought it was sinus pain. He said my CT scan was clear and 100% I was experiencing migraine. I am so afraid of what the side effects will be. Will my heart start racing? Will I have an allergic reaction and my throat will close up. This is so ridiculous since when I am in the throes of the migraine and the pain is so bad for hours upon hours I would take anything to take away the pain. Please does anyone have experience with this medication and how they feel after taking. He gave me 100mg dose. But I think I would cut in half or even 1/4 since I do see it comes in lower doses of 25mg, 50mg and the 100mg. Any input would be much appreciated.