Oh BTW, I assume this time you saved before looking into the scrying stone?
If you bring the scrying stone back to the priest without looking into it, he will do so. That doesn't work out very well for him, but it will unlock the door at the base of Lovis' tower (by the lake shrine). Assuming the door isn't missing from the outside, as well, maybe entering that way will trigger the appearance of the door inside, so you would be able to get out again? It's worth a shot, anyway.
