Uti - sever

I'm almost 10 weeks pregnant and just found out I have a uti. My uti is so bad that I'm throwing up. They've switched my medicine twice and I don't know what to do anymore. It seems like this isn't going away. I drink at least 10-15 glasses of water a day and my urine doesn't show it. 😭 My doctor keeps telling me to drink water and will give me another kind of medicine to try... I don't know what to do.