If you have a special needs child, then yes they may be sick more often than other children. They may get injured more often. They may end up in the doctor's office more often and have more "is this an emergency? I can't tell" appointments that you take them to because it's better safe than sorry.
I have a child with Autism and related disorders and health concerns, so I understand where you're coming from. I'm in the doctor's office with her several times a year for UTI's and bladder infections. In fact, I had to take her in last week for a suspected UTI (I wasn't even certain) and she had a raging UTI. Her communication skills are spotty, so I had to rely on her crabbiness, inability to sleep, wetting accidents, decreased appetite, poor color, and adamant refusal to toilet.
I've also had to get her ankles and wrist X-rayed because her coordination isn't the best. She has mild (I think it's mild, it could be worse than I realize) Proprioceptive Dysfunction so her balance and coordination and related issues are often not her friend. She trips and stumbles quite a bit for no reason, and it often injures her. When she cries for more than a day, we have to get it checked out.
She tends to get more illnesses than other children too, as she's a bit immune-compromised. Her diet isn't as good as it should be due to having a restricted diet from food sensitivities and intolerances, as well as having Sensory Processing Disorder that causes her to be a very self-restricting (go ahead, you can read that as extremely picky) eater.
I could go on, but won't. It's been a medical nightmare at times, but it's part and parcel of our lives right now. It's normal for us and I know that we're not at the doctor nearly as often as we could be, and we haven't made nearly as many emergency room trips as many others in our position have had to make. I've had to call Poison Control countless times. That's always fun.
But yeah, you're not alone.