Hi

When you apply for life insurance the check routine blood and urine. I think you should see your doctor let him/her know what is going with you and that your brother has Crohn's. Some say it is inherited others disagree. I know of a family (parents and siblings) that has both Crohn's and Ulcerative Colitis. They are now finding out other family members have suffered with one or the other not realizing this is what they have.
No one wants to go for a colonoscopy but at some point we all should be checked.

I'm not saying this is what you have as you have also been under stress with work.
This may sound dumb but have you switched toothpastes? Maybe the taste is making you sick.

The point you made about diarrhea makes me wonder though if there is something going on. Having diarrhea on a regular basis concerns me.
Do you have food allergies? Lactose intolerant,wheat, etc..
It's difficult to say exactly what is.
Please follow up with a doctor and keep us posted.

My son was throwing up every morning for a year we had every test done and they could not find out what it was and than we finally found out it was allergy he was severely allergic to dust mite. not sure if this help but just wanted to let you know but he threw up as soon as he got up not when brushing his teeth and he would be sick till about 10 am.