Worried About My Daughter

We are being referred to a pediatric gastroenterologist and an immune specialist for my ten-year-old daughter.  She gets sick every few weeks - fevers, chills, vomiting, dizziness that lasts almost a week and then she has body aches all the time (in different places, not the same spot).  It's been going on since Fall.  She got dizzy yesterday and fell, hitting her head on the bathroom cabinet. It can't be viral going on this long!  Plus, she's not passing it to my other three kids so it doesn't seem to be anything contagious.

I'd prefer it be gastro-related (that does run in my side of the family with my sisters, dad, and uncle) rather than the "C" word.  I'm really worried about that.  These consistent illnesses just aren't normal.