My girlfriend was diagnosed with Crohn's two years ago. AS you probably already know from research, Crohn's disease is a deficiency of the human immuno system, more specifically, your body's natural defences fight any foreign body that enters the digestion system, hence vomiting, diarrhoea etc. Malnutrition also is an effect, so bodyweight drops dramatically. My girlfriend ended up in an annorexic state before she was persuaded to visit the doctor. Steroids are used to control the symptoms, to build up your bodyweight, and to stop your antibodies fighting unnecessarily. My girlfriend now has several diseased sections of her intestine, but leads a very normal life (apart from taking medication every day) and has a normal life expectancy. If you think you may have Crohn's, i suggest you ditch your lack of faith in the GP, as it can prove fatal if it is not caught in time. But without putting the fear of the reaper on you, do you regularly experience blackouts when vomiting or when your bowel just can't take anymore? Also, have you ever thought it may be IBS (Irritable Bowel Syndrome)? Do some more research and visit the GP as soon as possible. My e-mail is available, or use the PM service if you wish to talk some more to me.
regards
Chris