Constant stomach aches

So I'm 27 weeks currently and the last 2 weeks I feel like I'm gonna throw up after every meal and almost anything I drink. This is my second baby and I'm not familiar with this and don't know what to do. I'm starting to lose weight cus I just can't eat. I don't have nausea or constipation or diarrhea, just cramps and bad stomach aches constantly no matter what I eat. I have my next appointment in like a week and half so I should probably bring it up but I just wondered if anyone had experience with this at this stage of pregnancy and did you find anything that helped.