I don't know that one gets a whole lot of physical symptoms for existential stuff? When I get to questioning I get kind of nervvy and start hunting high and low for answers, etc. and sort of more interested/anxious (I prefer to think I'm "excited" about something rather than "anxious" :-) and involved in wanting answers and to ease my unease.

Why don't you play it both ways and experiment? Changing how you think of things, looking at it from a different perspective could change how you think of things? I'm looking for a paradigm shift or change in perspective myself at the moment and am sort of enjoying imagining how those two might differ?