i dont have a whole lot of experience with edibles, ive done it about 4-5 times now (i eat my bowls too sometimes but thats so tiny im not including that). im usually a very patient person (almost too patient if that makes any sense), and with that i have grown accustomed to getting the onset of a high within a minute or two at most of vaping so perhaps in this case i am slightly impatient?
i have attributed similar feelings that you describe to me having to wait and then sort of wondering "well, did i do it right?" and similar. this sort of questioning in my mind kind of releases the emotions that are similar to that of being lost and not sure just what you have done, kind of like falling down a hole that you have no idea just how deep it goes.
i rarely have the full onset of "omg, get me out of here" but id say i brush against it on occasion. my tolerance appears to be getting lower the more i continue to toke, very odd but quite nice since i usually dont have much anyhow.
the mind is a pretty complicated thing and it takes little to set it an new (unplanned) direction, thats my take on it. i love letting go and letting the mind decide where to go unhindered to my weakness of associations and conclusions.
(sure hope at least part of that made sense, edibles are indeed special)