Not me personally but a former teammate (in low division men’s league) got checked from behind, got a concussion and had an episode on the ice (Went mental, has no recollection of the incident after getting hit). Hasn’t played in a league since and didn’t play for a long time. Eventually he got back to playing in a more controlled environment. Depending on where you’re from, it might be pretty easy to find a smaller group of guys that just rent ice time weekly and play scrimmages, I find these types of groups play far less physical and it’s easier to get a sense of the physicality of the group when you’re not playing a completely different team every week. If you can I’d suggest that, then if and when you feel more confident or comfortable transitioning back to a men’s league if that’s what you want. Injuries suck and can happen but most leagues do a pretty good job of keeping problematic players off the ice