Thanks MM. She's been on an antacid since Thursday night when the vet stopped her anti inflammitary liquid as she thought it might be that. She stopped her painkillers on Friday in case it was that - she said that the anti inflammitary often caused stomach problems and assumed it was that but then when it continued she said it was unlikely but could be the pain killers.
On Saturday she had an anti sickness injection but that doesn't seem to have done anything either.
I keep thinking it can't be anything serious as she is fine in herself - the only time she has any problems is immediately after eating. Lets hope they get to the bottom of it today.