Hey guys, I have a really weird bug on my main playthough. I have so many hours in it that I really don't want to just give up on it.

All other characters are okay, except for mine. My main character, out of the blue, could no longer fast travel, long rest, or really teleport anywhere. Even when I open the map, all the way points from the list on the map just disappeared. All the other characters in the party don't have this issue, including my friend's PC (we're playing co-op).

When I try to hit Long Rest icon, on any character, all I get is "You cannot fast travel from this area."

Anyone have any idea how to fix this, or why it happened?

More info:
I am playing my dwarf fighter in the underdark. I haven't long rested in a while, and the last thing I was doing is exploring near the ship where you fight dark dwarves. After fighting them, I went towards the illusionary mushrooms which disappear when you jump on them. I jumped on one, then misty stepped to the top and used the portals to see where they take me. I haven't done much since, but at some point a few minutes after is when I tried to long rest and realized that I could not. I tried different ways to fast travel or go to camp, but I cannot - not on this character. All other characters are okay, except for mine.