Tired of being sick all the time! How is this “normal”

I get really worried when my kids are sick.

it just really really worries me.

They seem to be getting sick all the time and I’m blaming myself like maybe I don’t make sure their hands are clean enough, maybe the dishes have some unseen bacteria I’m not getting rid of when I wash the dishes (our dishwasher broke)

Or maybe the house is to dirty even though I do clean maybe it’s not enough? Maybe I suck at feeding them, Or maybe it’s from my 6 year old bringing home sicknesses from school all the time idk.

My 1 1/2 year old has been throwing up a bit tonight and feels warm I took him into my bed and im just laying with him staring at him cause I feel so bad.

My 6 year old was hardly ever sick until he started going to school. He had maybe a handful of colds his whole life, and now it feels like because he never got sick he’s catching EVERYTHING. It seems like we hardly get a week off from someone being sick or at least a runny nose. I keep reading and hearing people say that this is normal and kids get sick all the time but that has not been my experience at all until school started and we added our second son.

I have a horrible sinus infection and it’s so bad I can’t breathe through my nose AT ALL and I’m also pregnant so I’m extra cranky I think.

With everything happening at schools and Al the sickness I want to homeschool but I know I couldn’t handle that and my son LOVES school it would break his heart if I took him out. I’m just tired of always being sick. Anyone else feel like this? What can I do?