[john70t]

I'm not a doctor, but the combination of the upset stomach sounds like you're reacting to mucus drainage from allergies.

- Check that your house has good drainage away from the foundation, the basement has cross ventilation, and that the plumbing isn't leaking inside the walls which could create mold.
-Try covering the couch and bedding with plastic for a few days/week to see if there is any difference. Spray with lysol first.
-Try altering your favorite foods and selectively remove peanut butters, soy, yeasty food and beverages, etc.... There is high fructose corn syrup in just about everything, but that should be avoided anyways.
-Loosing weight will definitly help the nightime breathing process.
-Buy a HEPA filter bagless vacuum and shake/blow out the filter after using it every time.
-Elevate your upper body.

Your doctors right in that this could be indicative of a more serious health issue.
Sleep apnea is a very serious issue and people have died from it.