I had the same symptoms a few years ago and the first thing the doctor did was check for ulcers. Turns out I did have an ulcer, BUT I was also 3 monthes pregnant. So I guess the symptoms could have been from either the ulcers or the pregnancy.

I would consult a doctor if the symptoms last for more than 2 weeks, most stomache virusus won't last longer than that.

I will say that before the diet I was constantly constipated and since I have been LCing (only one week) I have improved remarkably.

I know I wasn't much help, but keep us posted.