Detached retina possibly? I don’t think that is easily treated but not sure.
Perhaps severe vertigo? I had that once, only once, and was immobilized, couldn’t move my head, everything was spinning, and was definitely nauseated.
Family doc checked my eye, and said it was a bad case of vertigo, because my eyes were jumping back and forth, called it “nystigmas”, and a major tell-tale symptom of severe Vertigo.