Oh, lazy, that's so frustrating! Is this your regular doc or the doc in a box doctor? I've seen a lot of info lately that most sinus headaches are actually migraine headaches, infection or no. People with migraines wind up in the emergency room with pain, for goodness' sake. I have chronic sinus problems and "regular" migraines, and they both suck, however they are categorized.
I sympathize with your feelings of insignificance and fear of being pigeon-holed. I'm lucky that at this point I've found doctors who are compassionate and up-to-date with recent treatment options and research, but sometimes my pharmacy annoys me. If I need to get a prescription filled say, two days early, or god forbid need to get some filled before going on vacation, they act like I'm hatching some nefarious/loony plan to sell Lamictal or xanax (oooh, .5 mg--I must be a junky, right?) on the streets. There are a couple of folks there I simply refuse to deal with, and when this happens my shrink calls and straightens it out, but AAACK! I'm taking these meds so I can function, so I can approximate normalcy, not to get high. I don't want any altered states for fun. Altered states are terrifying, why would I want to do that on puprpose?
So, sympathetic rant there. Also, if your sinuses are really stuffy and irritated, sometimes a neti pot will help. Mine have to get pretty funky for me to resort to this, but it does help. Hope you are feeling better today.