Diary free, wheat free, high fibre and low fibre diets?

I'm having tests at the Dr to sort out a problem with my bowels as I've been having stomach upsets etc for a while. As well as blood tests he wants to start me on for different diets, each one on a four weekly period. Diary free, wheat free, high fibre and low fibre. I'm a person who loves my biscuits, cheese and milky tea so its gonna be hard. Does anyone know where I can find some good diets, menus and recipes to suit the diets my Dr requires me to have. I love meat, pasta, roast dinners etc and don't eat much fried food, I'm willing to try new things, but a little weary of new foods at the same time. I also want meals that I can cook for myself and partner with having to do two different meals. Any help would be great, thank you.