started modified diet

I'm 5 weeks post op and the dr. and nutritionist moved me to a modified diet.  For the past 2 days, I have felt queasy, had stomach pain and diarrhea.  Is this normal now that I'm eating more "real food"?  Should I just deal with it or does it mean I'm not ready for raw vegetables, fruit and some of the other things I've incorporated? 

I am new, but I have read the Vets say to go back a stage - or at least go back 1 step.  I think the Vets would say that it means that you're not ready for raw veggies...I hope a Vet chimes in!  Sorry you are struggling, and I hope it gets better!