question: My daughter is 9yrs. Only meds she's taking is Zyrtec and Nasonex. She gets sinus colds every 4-6 weeks. Just recently had one two weeks ago and did not need antibiotics. She is now saying her stomach hurts a little bit and her stool is dark green/gray. The last time this happened was right after a sinus cold without taking antibiotics and the colored stool lasted about a week. Her doctors won't test her because it only happened twice and it seems to go away. I'm concerned.