1 month ago I hit my head quite hard when I jumped out of a bench and hit my head against a balcony. It's likely that I had a concussion, at least a mild one, but I haven't been to a doctor so I'm not 100% sure.

The bad part of it is that I absolutely ignored it and treated my brain really badly (was sleeping very little, sometimes 4hrs per night, absolutely no cognitive or physical rest, rather the opposite) and day after injury I even ran 5k competition (I had no worrisome symptoms during the competition, but after few hours I developed headache and started to feel nauseous and a bit dizzy)

Now it's 4 weeks and I developed insomnia. I used to fall asleep within matter of minutes and sleep more than 10hrs on weekend, now I really struggle falling asleep and barely sleep more than 8 hrs. In addition, I have a mild pressure in head. What should I do next? Can I somehow reverse damage I have done? Or have I totally doomed myslef?