Since you have a yeast infection have you tried the Candida Diet? From what I've read it is very similar to the Specific Carbohydrate Diet which has helped me and others. Basically (as you have already figured out) you eliminate sources of sugar which includes most carbohydrates and starches as well as the obvious sugars.
It makes me sad to hear of your pain and struggle after having surgery that I'm sure was deemed to be the solution to your problems.
It seems sugars of all forms cause many diseases and dysfunctions. Perhaps the Candida Diet could help.
In remission April 2010 after 10 years of suffering and no remission ever
Jan 2010 started SCD diet (modified to remove dairy, fruit & juices)
Gluten-free=bleeding stopped in 3 days, 95% remission in 5.5 months on SCD
at 5.5 month stage homemade yogurt, hard cheese and some fruit OK
SCD Diet: Gluten/grain-free, starch-free, low carb, low-sugar
Supplements: tsp. fish oil, Vit D3 5000 with oil/fat, veggie juice, sunflower seeds, VSL#3, (4) Citrucel, (1) turmeric capsule, (1) calcium
Highly recommend: the book "Life without Bread" and the Specific Carbohydrate Diet
Rx: (6) balsalazide daily, mesalamine enema occasionally