Oh, I am so sorry to hear that after some better times you are having a rough go!
I find personally I have had a few " relapses"... Bad days/ weeks after relatively better ones. Sometimes, I think they come after overdoing. My most recent was at 24 weeks. I threw up everyday that week after being off and on with vomiting. I am always nauseous, but I think different surges of hormones when different developmental things take place can cause resurgances of vomiting( just my opinion)
So, I do find I have " good" and bad weeks.
I really hope you feel better and you don't have anymore relapses! You are strong and can make it- you already made it halfway!!! Love, hugs, and prayers