It sounds to me like your bump into the wall was less a trauma and more a trigger of an increase in your pre-existing anxiety. When you look for symptoms just because you bumped your head, it is very common to make more of a symptom that it truly is. The increase in anxiety alone can trigger a relapse of symptoms.

Try to relax and get on with your life. Being anxious about another impact will cause you to be more prone to clumsiness and poor reaction time. It can be a self-fulfilling prophecy.