Sick of Being Sick

Over here at the Duda house, I feel like we have been under quarantine for almost a month. We have been dealing with a nasty stomach bug that has hit all of us, but apparently doesn't want to leave my baby alone. Aaron has now been through the vomiting/diarrhea/get better cycle five times in less than a month.
It is beyond frustrating. I'm a nurse and I'm at a complete loss trying to figure out what is happening to him. Normal stomach viruses don't do this. Once you get it, you don't usually get it again, and certainly not four more times.
We have a doctor's appointment on Thursday and I'm praying she can figure out what is going on. I am exhausted and I know he is feeling even worse than I am.
One thing that we have been dealing with since Aaron was born is his weakened immune system. This doesn't necessarily affect all people with Down syndrome, but he is one of "lucky" ones. He tends to get sick a lot more frequently than most kids his age and it is harder for him to fight off illnesses when he gets them. It is stressful and frustrating, but overall I feel very lucky. He has never been hospitalized and he has only been to the emergency room once. But we do spend a lot of time at the doctor's office. You know you spend too much time there when you walk in and the front desk girls say "Aaron! We haven't seen you in so long!" and you were there two weeks ago...
So, there you have it. I am sick of these germs!