Hiya Zipity,
This is a board I haven't posted on before, hope I can be of help.
I agree with you it sounds like anxiety, the feeling of being somewhere before is so weird and will lead to racing heart and sweating. I personally, like you, have panic attacks that completely take over, and as you say this doesn't seem like a panic attack. It's no less frightening though for him, see if he can talk about his feeling, that might calm him a little.
Hope things work out.
goldenwings