I find this very interesting and something I tend to experience relatively easily with people I like and feel momentary (or larger scale) connection with in everyday reality. The 'high' coming from the sense of connection and that we understand each-other, a sort of momentary unity experience. I also agree that it is the result of neurochemical reactions in the brain in response to what is happening and to our subjective perception of the experience. If this is what "being held" is supposed to be in therapy, I definitely experienced it with my last T, many times, mostly due to the similarities between us. It is not the feeling and state I tend to appreciate the most in relationships though because it's far too transient, really a momentary feeling that can be reproduced by never lasts long (for me at least). But it can be a powerful drive to seek out certain kinds of people initially.

When I think about the life enhancing aspect of relationships, for me it is more associated with the state when it is no longer very new, thrilling, or even acutely relaxing, euphoric, whatever. It comes more from a stable sense of reliability, and established bond with someone I know pretty well and I am also convinced that they understand me well for the most part. It's more a complex, calm, stable knowing based on experience rather than a momentary feeling of bond or closeness. Maybe this is possible to achieve in long-term therapy even within its limits, in its own form. It's just not something I have ever tried or wanted in therapy but hearing/reading some reports from people, it does appear that they experience similar with a long-term T.