Second Guessing

I suppose this is true with any mom, but I feel like I'm always second guessing myself.

Peanut has been sick most of the last 4.5 months. He didn't have classical symptoms (was gagging and couldn't sleep), but was diagnosed with a sinus infection via CT Scan. He had one long bigass sinus infection. After 3 strong rounds of antibitoics, the last round being 3 weeks long, he finally got better....for a whopping 10 days.

And now he's sick again. Tomorrow will be day 10. He's doing okay but cannot eat much (gags and pukes on table food), won't drink much, and sleeps with Benedryl.

I question myself. Is he just being normal and going through first time exposure to germs needed to build an immune system? Is his reflux contributing to his sinus infection? Is his immune system too weak? I had both a friend and a pediatrician (friend) mention this possibility to me based on his recently chain of events. Should I request a blood test? I mean, hasn't he been stuck enough and had enough tests? Is it a normal preemie thing? An abnormal preemie thing? Not a preemie thing?

I guess it doesn't matter. It's a Peanut thing. But it makes me sad for him. I'm thankful that this is all the bigger issues we have, and I remind myself every day how fortunate we are. I know we'll get through it together.