Can't keep anything down
Definitely call your doctor. You do not want to get dehydrated!!! I had the same problem after my RNY, but mine wasn't due to nausea it was due to a severe stricture and everything I ate couldn't go down so came back up. I had to have a 2nd surgery to fix it, but I let myself get way too dehydrated and ended up in the emergency room. I had thought that it was due to the stomach flu in the beginning also. It is better to be safe than sorry and just have it checked out. Good luck to you!!