Sick Again-What's Wrong with Me?

So here I sit with a cup of throat soother's tea. I'm sick again. The second time within a month. I know that you don't actually catch colds but I had a feeling that being cold can actually lower your immunity. After a quick look up online I found that it was true. and of course Monday night I slept cold and woke up with a minor sore throat. Last night I turned the heat up and piled on the blankets in hopes that my cold wouldn't get worse. It did, but not as bad as I thought it would be. Actually, it's more of a runny nose than a sore throat now.