RandomBreeze, I've attended events for 12 step where there is actually a workshop on handling a potential "crash" afterward. In a safer than usual space with some progress, that can produce elation and a sense of well-being. When things get back to the usual, there can be a sudden let down, My experience with that form of it is it usually works itself out after a couple weeks of routine, but that's usually closer to the usual place (hopefully with some sustained improvement from before) than that elevated well-being feeling.

Not sure if that's the same sort of thing you're experiencing, but it is not uncommon after safe-space multi-day events for those working through issues.