Giving a personal case in point .
I was once badly wounded and in a ward with others in same situation , seeing others suffering was very traumatic .
I lost ALL sense of touch, taste, smell and vision was reduced to a very narrow tunnel, maybe 5 degrees . I had NO idea that any of that was happening though psychically I was doing well .
Brain was doing its thing .
After few weeks all returned ,Docs seemed cynical, Nurses didn't they saw it all the time . I did have to learn to write again , maybe brain blew a fuse on that one .