Gastric Bypass Surgery Support Group
Gastric bypass (GBP) is any of a group of similar operative procedures used to treat morbid obesity, a condition which arises from severe accumulation of excess weight in the form of fatty tissue, and the health problems ("co-morbidities") which result. If you are considering gastric bypass or have had it, join the community where we share our experiences and find support.

Are you able to keep down fluids? If you aren't, then you need to contact your surgeon asap.
If it's just foods that are giving you problems, back up a bit and start with just one food a day. Small bits, chew very, very well. Pause between bites. That should help.
If your nausea continues but there is no structural problem (like a stricture), your physician can prescribe an anti-nausea medication that can help you.
Good luck.
Good luck!