Sick again!

Took a taxi home today as I am feeling so lousy that I don't have any energy to change to a MRT. I am coughing so badly that with each cough, my head pounds like crazy. I am also feeling cold with my body aching all over. Eyes are dry too. Guess I am coming down with a cold or flu. Still can't quite differentiate except I know one is caused by a viral infection. Oh well, have to take some medication later and have an early sleep... This is the second or third time I am falling sick this year. What's wrong?