Kids shouldn't get sick

I know that now I'm asking too much, but don't you just wish your children wouldn't get sick? They just get so miserable and your heart hurts just to see them like that. If you could switch places with your child, would you? I bet most of you would. But unfortunately (or fortunately for some people) we can't. So what is the best way to care for them when they're sick? What if you have more than one child and they get sick at the same time? What are some techniques you have used that have worked for you?
I've been having a big problem lately. My oldest is going to preschool and she's been constantly sick. We live in a very polluted city, so coughs and allergies are most often. She brings in the virus and her little brother always ends up getting sick as well. When one gets better, the other one gets sick and then both get sick and so on. It's a cycle!! How can I prevent all of this from happening? It is very hard work to have sick children, let me tell you! We've been doing inhalations 4 times a day, and they hate doing that! It's bad enough that I have to force them to do it the whole time, but try doing it for half an hour each time. That's how much the doctor has told me to do. Otherwise if they don't get completely better and keep having bronchiolitis they'll end up developing asthma (for life). Oh, great!
I've been doing my best followig doctor's orders with my youngest, but since my oldest didn't have it nearly as bad as he did, I didn't take her in (I took him to the E.R). But now it seems like she's getting worse and while I'm doing everything I can to get my youngest to feel better, I'm not doing much for her. She won't let the inhaling mask get near her so she's just getting worse. I took her to the doctor a little over a month ago because of a never-ending cough (that had been going for a month already) and the doctor said that she was getting over it so she wouldn't prescribe anything. Well...I know I should probably take her to the doctor again but you know when you just know what they're going to say and you're going to get out of there thinking you have just wasted your time and that you probably know better because you are the one who spends 24 hours a day with them? Well, I'm still taking them in. Even if I have to get out of there frustrated. Because today is the 5th day of medicine and inhalation for my youngest and he's still not 100%. But that's what us moms do. We don't want to risk it, right? We'll go to any length to protect our children and their well-being. I'm just glad my children don't have and haven't gone through any serious illnesses or injuries.

Taking care of sick children sure is a LOT of work, though. I admire moms that have 4, 5, 6 (or more) children because sometimes it seems like I can barely make it with two. My patience level gets at its highest sometimes and I get completely exhausted. Before I had kids I wanted to have about 6 children. Now my number has gone down. Way down. Before we have kids we're so totally oblivious to what having children is like, even if we think we know, we know nothing.

A few days ago my aunt and I were talking about the fact that our children seem to always be getting sick and one topic led to another and we ended up talking about all the things that happen before we get to church in the morning and how people that have no children (or even couples that only have one child) have no idea all the things that may happen before we get there. And that sometimes we're even judged by the fact that we're late!
Anyway, I went a little off the subject here, but I've been a little too exhausted lately and just needed to get it all out. I know that this is all part of motherhood and we all go through the same things, even though sometimes it seems like we're totally alone. I love being a mother and wouldn't have it any other way. ;)