Welcome and please don't be ashamed to see your Dr., they have seen and heard it all.
It very well could still be something doing with the flu you had as there is a stomach bug going around this year that doesn't seem to want to leave. However, if you see no change soon...PLEASE..contact your Dr. and maybe even see a GI Dr. Stress will raise havoc on your sytem as well.
Make sure your eating a lot of fiber and fluids as well.
Best of wishes and good luck...JJ...
BTW..You could try taking a Probiotic Acidophilus. I had miserable bowel problems, mostly Diarrhea and loose stools till my PCP and GI Drs. told me to take them. Really worked for me.