Is it the weather that cause people to get sick, or people themselves get sick?

For some reason its very hard for me to get sick, but after I got my flu shot I started to get very dizzy. My arm became very sore and numbed. Suddenly, I started getting flu symptoms. It was like I couldn't sleep at night, hard to breath from my nose with a stuffing and runny nose. I also had a very bad cough with a lot of dark green mucus. The sad part was that It was so bad, it gave me a bad migraine.

Then my two sons, got sick from me also. Which, was even worst because they are much younger and can't handle all the symptoms as much as  I could. My baby had such a bad time breathing through his stuffing nose, that late at night he would keep me up every hour crying, until I hold him to sleep. It made me so tired even the thoughts of coming into my morning classes.So, I took my two son to the hospital and they couldn't do much nor give any medicines to them because they were still too young. I was pretty mad, the fact that both of my son are barely breathing right and every moment I think about it, it would make me more mad.

 Then my cousin was like, maybe it's just the weather that is starting to change that cause the children's body to not react fast and its making them sick. I started to think, maybe she was right. The weather here are pretty bad. I mean for summer it gets too hot and sticky humid. Then for winter, too cold and cause more illness. The fact is some people do have weak immune system that even going outside can cause them to get sick for a long time. I've struggle a lot when my older son got sick and when I took him to the doctor, they told me he had a very weak immune system. I started to panic, now even taking care of him being more careful with taking him outside with a jacket, even if not needed because windy weather can cause him to start with a runny nose then leading him to the worst.

In my decision I think that people often get sick, because of what their body can't handle yet. Like, the changes of the new coming weather or even getting contagious germ spread from another people passing it to one another. It's just a pattern that keeps repeating, and after you get a little better it'll soon start all over again in a time period. Therefore, if  you know your starting to get sick the best thing to do is start taking care of yourself first. Eat medicine before you start getting worse, better yet be safe about passing it along to younger children; it cause more effect towards them then hurting yourself to see them like that.