I posted yesterday how I react to flu shots, mainly I spend the whole winter getting mild cold episodes. Some people considered it a vaccer vs anti-vaccer discussion although that is not relevant. It’s a personal choice. If you try something and it doesn’t work you probably shouldn’t try it again. Usually, I don’t get sick easily so not taking the flu shot is better in my case. However, with my son going to preschool I have been sick a few times last year.
The secret to not getting sick is to fight it whenever you feel the early signs. For me, it’s usually my sinuses, whenever I feel like they are infected and I start having a headache I start taking remedies like the ones in the link below.