I had horrible nausea from my gastritis that was caused by bile reflux. The doctor put me on cytotec, which does something to protect the stomach lining and I guess help it heal. I was supposed to take it four times a day, but after a week or so I just took it twice a day because it was too hard to remember. Anyway, it helped a lot. I feel like the gastritis is gone now (no more symptoms). However, there were all kinds of horrible scary warnings about this drug and pregnancy, because it can apparently cause really bad birth defects.
But you should at least be feeling somewhat better after 5 weeks. If you aren't feeling any better at all, I would go back to the doctor and ask about other treatments. Hope you feel better soon.