Someone told me once this type of thing happens, one of the regular curses seems to be a de-aging one, but only for a couple days and the victim doesn't lose all of their memories, they are simply altered.

[So not likely, even though there is a small chance. He wants to believe that is what it is, and things will turn back soon. He's already planning to track down Hel and see what the fuck is going on.]

If not, then I guess you'll stay here like this.