Sick, AGAIN

Yup, that's right, I'm sick again. I can't believe it. It's to the point now that I'm embarrassed because I've called into work so much. But what can I do? I am doing everything I can to try to stay healthy. I take a multi-vitamin, drink fluids, eat right, etc etc etc... If I'm coughing up a lung, have a fever, am constantly congested, and getting no relief despite the drugs I'm taking, what am I supposed to do??? Argh.