First, I hope you'll feel better soon!

OK I'm curious here... my sister and BIL have both got flu vaccines for years, yet they seem to get some kind of flu every year and generally seem to have a poorer health. They are about ten years older then me.

I have the impression that when you get all these vaccines (or antibiotics) your immune system will weaken. Isn't it better to just eat healthy and stay away from people coughing - if you can?