I'm sorry you're going through this! I'm sure you've talked with your Dr about it? There are some prescription meds you can take now in the 3rd trimester.
I have zofran I get from my OB for the nausea it helps a lot
My doctor gave me zofran for that and it helped a bunch. Mostly for the vomiting, nausea was still there! I believe my symptoms completely stopped maybe 3-4 weeks ago.
Noooo that sucks so bad. I had really bad nausea for three weeks first trimester. Are you doing all the anti nausea meds? The unisom b6 etc