Very sorry to hear about your bad experience. The flush recipe you've chosen was simply too extreme for a begynner, especially the one with acute problems, like you.
Even I would not dare to flush this way, and I have done 13 flushes till now.
Don't give up! Try Hulda Clark flush, after you have been through this one will be a piece of cake for you.
Operation will not solve the problem, only for a while.
What is one little nauseaus night compared to all those operation preparations, anastesia side effects, awful scar, post operation recovery period, check-ups... and long list of digestion problems you may get if something goes wrong during operation?