Down with sickness again!

Not again, after barely two months and im down with fever and flu again.. My immune system used to be strong last time, but after taking supplements i.e Vit C and Omega 3 occasionally, it doesnt seem to be as strong as before. How irritating and tiring it is to have a runny nose, sorethroat, flu, fever, backache and headache at the same time? argh! i cant sense anything with my nose, i cant stand too long or else my back starts to hurt, and i have to frequent the toilets to get rid of the mucus. Boring! Just came back from the clinic, given 4 types of medicine. How strange the cough syrup tasted spicy to me??? Any clue.. watever...