It absolutely is. I'm pretty sure I have it from all of my concussions. There's some very dark times that seem to come out of nowhere. I've been in contact with the Concussion Legacy Foundation with former wrestler Chris Nowinski. I'm donating my brain to them when I pass for research.
But for anyone that ever has these thoughts there's a lot of people out there that love and care about you. They may be people you've never met before. If you're having issues come on here. We will be more than happy to help. If you don't want it public, private message me or anyone else. I know I had to do it once. A former poster helped me more than they'll ever know.