Hi - sorry for the essay by the way. 
I've had IBS symptoms since I was about 6-7, am now 32. I mostly can't go to the loo, occasionally urgently need to. Tried several medications, including Buscopan, without much success. Buscopan recently left me unable to go to the loo for a week as totally constipated. I try to stick to a very high fibre diet, otherwise I can't go at all.
I had a flexible sigmoidoscopy (camera up bum) a few years ago which was excruciating & has left me with permanent pain & ongoing frequent bleeding, I also can't always tell when I need the loo until about 5 minutes before it's too late so I'm sometimes pretty desperate & in a lot of pain & bleeding by the time I can find a toilet. The hospital confirmed there was nothing sinister going on, but apparently I have a severe fissure which refuses to heal & keeps reopening every time I have an 'episode'.
I've worked out, over the years, that I'm sensitive to a number of foods which increase my problems. Including wheat, animal fats, onions, certain spices (especially chilies) meat if I have too much, mushrooms, bananas, sweetcorn. The list goes on...
The doctor really isn't much help, I don't know if I'm not asking/saying the right things, if they are just not bothered, or if I'm just asking for more help than is actually available.
I've had a blood test a few years ago which ruled out coeliac disease. Is there anything I can do or is it really just a question of living with my symptoms & making the best of it?