This can't be normal

Hi ladies, I am seeking some kind of advice or if anybody also went throught it and how did you deal with it?
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First I must say I have suffered with migraines my whole life, since I was a little child. Everything got better after I had sinus surgery and I only got those bad migraines around my period.
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I am now 16 weeks pregnant and I have been having migraines for 3 days straight, or sometimes is not a migraine but its a pressure pain all over my head, very strong and horrible!
My doctor prescribed me a medicine but it doesn't help, and I cant stand this anymore! I know headaches are normal during this time, but I never heard of someone having such bad shooting pain almost every day! I drink plenty of water and try to stay as healthy as possible. What could this be? I'm desperate.