A heavy pillow did not aggravate a concussion. It aggravated anxiety. Same symptoms. Different cause.

This bump into the door frame caused a startle, a tender spot that is keeping you aware of the impact and maybe aggravated your neck. The tenderness is because there are lots of nerves in the 7 layers of skin outside the skull. They can take a long time to settle down.

The muscle tension alone from the tenderness can cause symptoms.

Please try to remember how the brain can tend to replay old symptoms when there is a later event that is similar to the real injury. The sensation of symptoms are real. Think of it as a flashback and how real they can feel.

Some ice and things to distract you and you will be fine.