I'M Sick

WonderinG why whenever I Came back to study, I will Straight away hit by flu, fever & Cough?? My housemates told me is because of I can't adapt to the natural Environment here...Huh...Day 3 and yet, I'm Still sick & keep on sneezing... Sigh..But I got lots of assignment & a FYP is still waiting for me!!How I gonna do that?