Hi there, the horrible sickness you're feeling could be as a result of dehydration and not eating enough. I am about 5 weeks post op and the feeling I had was like continuous morning sickness, horrible so I really feel for you. Healthier Weight said it would be a good idea to eat little amounts every 2 hours to try and build up calorie intake ( I was only having about 300 calories a day) and drink PLENTY. I have to say this has really helped and if I get that sick feeling again, if I write down what I've had during so far that day it's usually down to the above.
Hope you feel better soon, there is light at the end of the tunnel!