When my Crohn's first struck and disease was active I was nauseated 24 hours a day, seven days a week for 2 1/2 years. At that time it was due to a high grade partial obstruction. Eventually I fully obstructed and ended up being admitted to hospital from ER vomiting feces. The ONLY relief I got during those 2 1/2 years was a shot of demerol and phenergan in ER.
The nausea knocked me down to the point that I was going to lay there in my comfy hospital bed w/my comfy pain shots and die. I don't ever want to go there again.
I remember that I could blow up like a ballon and look like I was 11 months pregnant w/twins. I remember I had pain so bad I would lay in bed crying No more, God, please, no more.
To this day I remember I had the pain and the bloating - BUT - it is the NAUSEA that I actually, really remember, VIVIDLY. I panic in no time at all even now, thirty years later, when I get the least bit nauseous.
I was fortunate to have a 20 year remission of symptoms after my resection. But the initial symptoms on the Crohn's return was nausea. No pain, an occasional twinge now and then.
It turned out tho that altho the Crohn's had returned and was silently active, the nausea was caused by bacterial overgrowth due to a high grade partial obstruction at the old resection site. We were successful in treating that w/alternating antibiotics the first 10 days of each month for several months. Then I would only start the antibiotics if I got "the queasies" (the forerunner of full blown nausea). And after a year or so I was nausea and symptom free again. (Of course, as soon as it was determined that the Crohn's was silently active as well I also took Pentasa and Imuran as maintenance meds but the antibiotics had cleared the nausea by that time).
Like SGirl, I learned during pregnancy, it was better to throw up and have the nausea gone for the rest of the day than to NOT throw up and be nauseous all day long. During the bacterial overgrowth nausea, throwing up would only reduce it to "the queasies".
You might want to try a liquid diet for several days and then a soft, bland diet before eating "normally" again for possible stricturing and partial obstruction.