I have been there. Trust me if that frame fell on your head. You would be pain.

Your anxiety is making things real and it mimics concussion symptoms. I think the shock of this incident (frame landing on your shoulder) did a number on you and your over analyzing it,creating a severe anxiety reaction. Don't feed the anxiety monster.

Have you seen a CBT counsellor? I saw one and I learned coping skills. It made a huge difference.