There is nothing to Treat as a concussion. There is no general concussion treatment.

You treat the symptoms, not the diagnosis.

80% of concussion symptoms are neck related.

Take care of your neck.

The doctor or whoever says to be concerned is wrong.

What does that doctor suggest doing about it? What is that doctor's training level regarding concussions?

Yes, take the risk of concussions seriously. Wear a good helmet. Many bicycle helmets are marginally better than useless. They don't protect because they don't stay in place.