How come I was recovering from a cold but get another one instead?

A few days ago, I caught a cold- sore throat, mild fever, runny nose. It's the fifth day and I was better except for a cough. Just now, I started having a fever again and my throat and head aches again. It's like repeating the cycle? I've seen the doctor and did everything he asked me to do. Is this... show more A few days ago, I caught a cold- sore throat, mild fever, runny nose. It's the fifth day and I was better except for a cough.

Just now, I started having a fever again and my throat and head aches again. It's like repeating the cycle? I've seen the doctor and did everything he asked me to do. Is this the same cold or another one? Advice?
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