I'm 34 yr old female, I suffer from headaches since I was a little girl about 7 or 9 to be exact, I have been taking imitrex 100 mg for about 6 yrs now, it really help. But I have been getting more frequent headaches for the past 3 weeks and for the fast 4 days I can't get ride of my headache, I take the Imitrex it goes away but that night or the next morning my headaches is back. This morning I noticed a bump on the lower left side of my head, it hurts only when I touch it and it feels hard. It's related to my headaches? That never happened before. What can it be? Should I be worried?