I can truly sympathize. I've had migraines with aura since puberty but went through a time about 6 years ago where I went nearly 3 straight months with a migraine every day. I literally didn't leave the basement unless it was to see a doctor or at night. I'd go days without sleep at a time because I was in too much pain to sleep, then I'd collapse from exhaustion and start again. Found my trigger and haven't looked back. I can live with my 2-5 a month now.

I hope you find your answer soon. I'm sure a doctor (or you) have thought of this but remember to check any changes in medication that happened when or near the time the increase in migraines began. Even if it was an increase in frequency before they became daily. That was the key for me, doctors kept looking at when they became daily or near daily instead of at the time they began to increase.