OCD with health

Hi I have had ocd my whole life. I was diagnosed with it as a child. I have been off and on it seems like in a cycle with specific worries. Health is a huge tick of mine. It seems to worsen when extra stress or change is implemented in my life. We just moved me and my roomates and I have been worried about something intestinal going on. I am sure it's probably just ibs or something simple but I always jump to worst case scenario (diseases terrible things) when I don't feel good. This intestinal thing has been going on since the beginning of July. I think it started to worsen when I decided to take probiotics. I should have never done that without asking my doctor. It seems to have made it worse. I did that however because of constipation issues and wanted to try to fix it myself. Will never do that again. I have an appt with the gastro doc on Aug 3rd but I cannot stop the worry that I have something terrible that's killing me or will kill me.. Help?? Has anyone else had these worries/issues? I don't really have that much abdominal pain very dull and seldom. I don't have any blood coming out of anything or any narrowing of stools etc.. Thanks

-Travis

OCD with health