I would not be concerned about a hard body check. I would be concerned about a head to ice contact. The boxing has already left you with a history of Sub Concussive Impacts and Concussion. For a PhD candidate, you are putting your future at risk.

I have seen the impact concussions can have on math reasoning. I was excellent math student until too many times heading a soccer ball. I have ridden a roller coaster of math skills ever since (30 years ago)

A mind is a terrible thing to waste trying to have fun on the ice or soccer pitch or football field.