Lost Most of My Skills

Me and Tara returned to Rocky Point Camp with my little buddy Tigger to see what we could find for weapons and what else we could find for armor. I found a sword, and Tara found a bow and a sword. We found some more armor but no complete sets. We don't have any cuirasses. I was going to make some new armor, but I have a huge problem. Not only are my combat skills gone, but so are most of my other skills. I can't remember how to make armor, steel, and all of the other things that I used to know how to make. Most of my knowledge is gone. Something has happened to me. I told Tara about this. I asked her how she was feeling and if she was having the same problems as me. She said she was fine and that she hasn't lost any of her skills. This isn't good. I think the Endbringer did something to me during its attack.