Hi everyone. This is my first post. Brief background: 33 year old guy, maybe 10 moderate concussions (never a loss of consciousness) suffered within the last 5 years from ice hockey. The last one was about 6 months ago. Since then, very minor impacts to my head (a coworker throwing a couch pillow at it) or quick movement of my head (trying to tear off a piece of been jerky with my teeth, and having the piece snap off quickly) often result in difficulty concentrating immediately afterward and lasting a day or two, and mild headaches starting the day after and lasting between one and two days. I've averaged about one of these aggravating incidents every week for the past 6 months, despite trying to be pretty careful.

My question: I keep trying to test my limits by doing some (about 5) pushups or pullups after about a week or two of not having symptoms. This tends to bring about the same sort of immediate concentration difficulty and delayed mild headache that I described above, plus being able to feel my pulse in my head immediately afterward. Is this common? Should I be more careful to try to never do anything that causes these symptoms?

Anyone have any idea what exactly is happening inside my head during these seemingly minor impacts and head movements? The headaches feel like I imagine it might feel for some blood vessels near my brain to start bleeding -- some slight non-localized increase in pressure. Any chance it could be a minor chronic subdural hematoma, and these incidents keep causing a small amount of bleeding that stops on its own?