[DuePew]

For whatever this is worth, some projectors have had similar experiences to yours and they stopped when they left the area in where this happened. Robert Monroe had a similar experience to this and found out after various attempts to extricate himself from this 'stranger', and eventually realized that his 'stranger' was himself- some sort of half-projection. I have had similar experiences to yours and found myself released as soon as I came back (but with after-effects, he was there after my waking and I saw him dissappear) but was never bothered again. I think it was an astral occupant of wherever I went, so the next time I went there I just avoided 'him'. No consequences, I just try to be careful.
If it makes you feel 'icky' I suggest a salt bath or shower, and like BeeK said, shield before you go. I guess that's what happens when we go somewhere for the first time- we don't know what to expect.