Perhaps build a bigger chessknowledge foundation where you can rest on?
If you also experience this in ither aspects of life you might want to talk to someone about it. Not because you are crazy, but because that person can help you cope with it.
When I quitted smoking (unfortunatly I started again) I too sometimes got overwhelmed by a smokeattack. One moment I was so happy that I quitted, and then in 2-3 seconds I made a plan in my head where I was going to get cigarettes and why it was ok to smoke 1 or 2 and why I deserved that. This however was not me, it was my brain -the addicted part- that was talking. I learned that it would go away if I did nothing. So sometimes when it came I was actually a bit amused by it: "well, well.. there is mr addicted brain again! what lies are you going to tell me today why I should smoke?". Then I just sat down and let the feeling and thoughts go over me and after 5-10 mins it was gone.
Now 5-10 mins is to long for chess. But something tells me that you need to recognize such an emotional state and try to label it as such. When you know you are in that state, you also know that you must not act now, because usually they are stupid mistakes.
But maybe its a completely different phenomenon and I am talking bs. I dont know.
Since I was a kid, I've been too excited
But Chris.. I think your main problem lies in the fact that you only play Blitz. And blitz is superfast and often a blunderfest, even at the higher levels.
First you must become good at the slowspeeds, then you are ready for blitz and bullet. Start a bunch of online games and force yourself to do two things:
- read stuff about the current gamesituations. This helps you learning more about chess. For instance: read about the opening you are playing, watch a video about middlegames when you are in the middlegame. Got a rook endgame? Watch a video or read an article about rookendgames.
- never move within 5 minutes. In fact, if you play 3 days/move force yourself to never move on the first day!
ElKitch, thank you so much for sharing. I will try some slow games...
A few deep breaths can do wonders...
To clarify, someone once said he felt as if a wall was advancing. Add time pressure and then sometimes I find myself coping badly with pressure. For example, yesterday I was playing a Pole. He knew my game plan and thwarted wat I attempted. Suddenly, there I was feeling stuck.
Having to move, not having a plan against a superior opponent. And I just gave up.
Undoubtedly, at some point physical fitness will play a role 
Hi Guys
what's going on?
Out of nowhere, I still get emotional waves coming out of nowhere. Always a bad casual player (never joined a club), as a kid this effect would derail my game catastrophically. Now that I've begun playing again being middle aged, I still grapple with the same silly issues.
1.) Emotional instability, lack of peace of mind and
2.) lack of concentration, leading to unforgivable serial blunders
This is more than just the usual lack of knowledge etc. Just wondering if any of you have overcome such bad habits or character flaws and how you managed to change for the better?