I'm really sorry to hear you're still having problems. Were you ok on the VLCD, and it got worse after!
Before the diet I had problems nearly everyday, and there was a brief spell of about 2 weeks with mild problems during it.
You really need to push your doctor to help you, or to refer you to a specialist. Life is too short to live with problems you don't have to and IBS is soul destroying.
Follow his instructions to the letter, and if he seems to be at a loss ask about a referral. Docs like most of us don't wanna put the effort into difficult cases. There could be an underlying cause, not just food problems, which needs attention.
For me, it seems to be dried fruit, onions, spicy food, bread, dairy products and fat. Apparently that's fairly typical!!!!
Best of luck! Keep us informed!