Have anxiety. Neck /back issue. Had cool a/c on, like I was hot & cold, mostly cold on hands & feet. Turned a/c off. I'm kinda cold still. What is this?

These could all be. symptoms of acute anxiety (panic), but before you accept this, go to your MD and get a general physical. There are 33 symptoms of anxiety, and you have some. Here's a primer: http://www.psychologyproductsandservices.com/page2.html.
Anxiety. This is probably a panic attack or a physiologic reaction to your state of mind. This may be stress or a general anxiety disorder that one needs to get under control See your doc to make further dx and treatment possible.