If I may be the mundane healthcare worker for a moment: please trash your helmet and buy a new one.
A fall/impact compromises the helmet, even if it looks ok you can't trust it. It did its job with your fall on the ice (it took the energy of impact instead of your head taking it) and it's best to get a new one.
Ok, healthcare worker nagging moment over.
(sorry, I can't help myself)![]()