Upper back & Neck pain due to AC?

I just put in my air conditioner but every time I turn it on and the room gets cool, my neck will hurt. I mean the muscles in my neck and upper back will contract and get knotted and it is very painful. Why would the cool air cause this, it didn't happen in the winter? It stinks because my room is a sweat box... show more I just put in my air conditioner but every time I turn it on and the room gets cool, my neck will hurt. I mean the muscles in my neck and upper back will contract and get knotted and it is very painful. Why would the cool air cause this, it didn't happen in the winter? It stinks because my room is a sweat box without my ac. What does this mean, what could be causing this to happen? Is this normal? Any suggestions would be appreciated.
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