I've been having trouble with nausea, stomach pain, and stomach bloating off and on for several weeks. It usually goes like this: I feel sick. Then in a short while my stomach starts to hurt, and some time later, I have abdominal bloating. The only common thread I see (other than stress) is that often when this happens, I am also having lots of sinus drainage. Anybody familiar with this?

Sinus drainage can cause nausea but I am not sure about pain and bloating.