flu shot = get sick

I usually never get sick and i never get the flu shot. But it was highly recommended since i now working in "the medical field" with tons of sick people. Well i got the shot and now i am sick! I'm not getting it next year no matter how much they "recommended" it. I know the flu shot doesn't actually make you sick, but i wonder if it weakens your immune system some how. I hate being sick and especially at Christmas. I kept Kevin from falling back to sleep last night because i was snoring. :(