I had nausea and vomiting all through my first preggo and I'm 19 weeks now and still get it everyday and evrytime I eat I take a few bites and vomit then go back to eating.
With my first baby, I had nausea and vomiting for all 9 months. It isn't common, but it does happen. I've been having migraines with vomiting recently but that's a whole different topic. LOL.
It has not happened to me so far but apparently its pretty common to suddenly get nausea again in your 2nd trimester. My colleague had nausea / vomitting in her 1st,2nd , 3rd trimester and it was so bad she had to be hosp a few times for dehydration but her kids were born healthy and normal. It was apparently due to her raging pg hormones. I also read (cant rembr which website) that it does happen to some women to suddenly get nausea again in their 2nd or 3rd trimester.