Mental Breakdown in chess

Late comment, but everyone gets a mental breakdown once in a while. If you're having one, it's a good sign you really are obsessed with the game itself. Therefore make a realization to be more do well and be more consistent. This occurs to me commonly, and I can absolutely relate.
To deal with chess mental breakdowns is to distract yourself. Stop playing chess for a few hours, and do other activities such as watching YT, and all. You may return later, but before doing so, always warm up with puzzles or watch a few chess videos.
As to your situation, just be stronger and again just don't relax and keep improving. Playing and mastering chess is a slow and long painful process.
Hello, I've recently been having mild mental breakdowns and a recent major breakdown after some turn of events that didn't really helped me out with chess.
I recently lost a chess tryout OTB and a small event chess tournament OTB which was hosted by the academic institution I was enrolled in, during the tryout I lost due to my overthinking as I was having a small tilt in the game and regretted it so deeply, I analyzed and evaluated the game, I had a winning position as my enemy had only one pawn and a rook, and I had 3 pawns and a rook, but due to my possible ADHD I may have diverted my attention somewhere else and lost the game.
During then the tournaments, I was about to be seated for a tiebreaker for the championship title (I don't really think it means much since it is just a small event, but I thought it could be my stepping stone somehow) as I was going to win a game that will make it, but then due to my recent loss at the chess tryouts, I overthought about the unfortunate event that I lost my attention and gave away a winning game.
Recently these two events gave me mild mental breakdowns and I seemed to be tilting for an entire week due to it, I am losing to players that are 400-300 rated below me and all I do now is just give away the game when I am winning because I cannot keep up with the current psychological and mental stress. The events may not mean as much as those chess tournaments where grandmasters participate on, but I feel like that in my level, they may be opportunities for me to actually improve in the game further, but they merely dissipated in front of my eyes like a bubble.