Msc, first of all when you say blood in your stool is it red?
If so it may be a local tear or abrasion.
Now this is important if you see what appears to be black tarry stools , you need to get to a hospital ASAP as this is a symptom of a Gastro Intestinal bleed. So calm down and take care of yourself. Crohns is still considered a rare genetic condition so you may have IBS or similar. Is there fever, frequent bowel movements ( some people have up to 20 BM's per day and mostly diarrhea with blood clots? And really painful cramps. There are many successful treatments these days for Crohns like Rimacaid.I have a best friend who has an active full life... (and eats all the right things without sacrificing taste or variety) and he was considered untreatable by the time he found the right doctor.
So take a breath and calm down.... that way you can make proper decisions.
Hope this helped and didn't frighten you any more than you were.
Hepcat
Well it is very good that you are going to the doctors. Blood in stool is never a good sign.
If you have Crohn's Disease this may be interesting: http://globalnews.ca/news/2968985/researchers-may-have-found-the-cause-of-crohns-disease/ or look up yourself "Researchers may have found the cause of Crohn's disease.