Constantly Nauseous

I'm 22 weeks now and the first trimester I had no nausea or vomiting. but now I'm vomiting at least once a week and nauseous almost constantly to the point I'm scared to eat or even drink water. it's worse at night and keeps me up. I've mentioned it to my midwife and she just says its normal. didn't have this issue with my first pregnancy at all. any advice would be helpful but will be bringing it up with my doctor next visit