After the rush I get the odd goose bumps. The feeling is also becoming an uneasy one, as I cannot pin point when or why I get them. We can't diagnose but from your email it does sound like a classic spontaneous panic attack. Many of us have this type of attack. We have been working with this for a number of years using the theory of dissociation.
Dissociation is another word for 'self induced trance state', altered state etc.
I can tell that I am gong to get the following feelings ahead of time approx. Our research and our own experience shows that the 'whoosh' happens during the dissociation. See in our 'Research' section, under 'Analysis of a Panic Attack. It is very easy for many of us to go into a self induced trance state. It can happen at anytime, including relaxing, watching tv or it can wake you up at night.