Scared I might have a tumor

I know this sounds so stupid and I am going to the doctors Monday but I’m afraid I have a brain tumor 😢 I’m 15 weeks pregnant and have been told dizziness is common but is it really normal for me to feel this way 24/7? I wake up and go to bed feeling so dizzy. I get a headache almost everyday and throw up almost everyday. Has this happened to anyone but it turned out to be fine? I’m such a worry wart but can’t help it