No it's very common to feel this way. I know I did. Some people describe it as being like the old movie Invasion of the Body Snatchers. It still looks like your spouse, but it's like aliens came along and planted another person inside their skin.
As for whether he will come back again, he very well might. They sometimes will come out of the fog and go right back to being their old self. My XW wasn't one of them, but even she has gone partway back. Maybe now about 50% the person I was married to and 50% a stranger as opposed to 95/5 after BD. And it's taken all these years for her to come back that far.
Those of you who have been strong enough to stand for years amaze me! Perhaps I will gain that type of strength over time but, right now, just 1 month post-BD, I just want to run away and never see this "alien" again. Unfortunately, we have 2 children so I will have to deal with him, whether he snaps back into reality or not, for the rest of my life perhaps. OMG!!!!!!!!!!!
H and Me - Both 45; S13 and D9 BD - 11/2019 Married 14 years; Together 20 years