Third trimester advice

I’ve barely had an appetite with baby girl my whole pregnancy but the second trimester was much better for sure. But since the third trimester started I can’t eat at all. I’m beginning to worry. I don’t sleep, I’m in constant pain, I can barely eat or make myself worse if I force myself to especially with out my medication which makes me so tired that I try to endure the sickness bc I don’t want to miss out on my boys, not to mention my sever acid reflux. I’m loosing instead of gaining at a time her and I are suppose to be gaining the most. My ob has prescribed me sickness meds bc she needs way more nutrition then I’m able to give her and he’s told me about ensure drinks which I had to use with my second sons pregnancy. But I’m just wondering if any other mamas have had the same problem? Any tips? Words of encouragement? I just want her to be healthy. 💔👣 I’m 35 weeks 1 day and only have to make it to 39 weeks for my third scheduled csection so I feel petty asking but I’m so miserable. 😞🤢