Hi Marcia,
I'm really new to this, I didn't even think to check the profile thing. The birthday thing is pretty neat, we're just on the other side of the country!
I was wondering about tension type headaches that can lead to migraines, cuz I've dealt with that too. Sounds like you could be having some of that going on. Oh yeah, and my migraines are hardly ever one sided like some doctors insist they have to be. Your doc doesn't sound real compassionate with only giving you imitrex. I couldn't have made it without drugs like, Midrin, Fiorinal, & Axert which is a different triptan. Sometimes a certain triptan will quit working, Imitrex and Zomig don't work for me anymore. I never found any of the drugs with codeine addicting at all, but they can cause rebound headaches if you take them for more than about 3 days in a row. Also Excedrin migraine can work well, it's just aspirin, tylenol with some caffeine.
I went through all the head tests, MRI, cat scans and such and they can't all they're for is to rule out anything "organic" such as tumors or weird blood vessel anomalies. But they can put you at ease if your headaches have been different from what your used to, or to finally convince yourself that you don't have a brain tumor!
Probably more info than you felt like reading! Good luck, I sure hope things improve. I had about 5 years of headache hell after my third child was born and I'm so glad to be better. Hang in there.