Sick again

It seems like for the past couple of months, once I get over having one cold, I get another one. I am so tired of going through a box of tissue just about every day. I've been drinking plenty of liquids (cold and hot), using my Neti-Pot, and increasing my Vitamin C intake. I hate taking medications though. What do you do to help when you've got a cold? Leave me a comment and let me know.