I doubt that's considered SI. You did do it to yourself but it was while you were in the moment focused on something else, you weren't purposely doing those things to hurt yourself you were just trying to win. Being so reckless is a bad thing and you said you become manic so it might have everything to do with that. Maybe you should figure out a way to keep yourself in the zone but not get lost in it and the adrenaline, like some kind of grounding technique or meditation.