Thanks, everyone!
Wow. I posted this late last night, just to vent and get it off my chest, not really expecting such a great response. For that, I thank you folks.
I would like to respond to everyone, but that would get crazy, so I'll try to hit the high points. First, a little more background.
Pool is my escape. Between the issues I have at home and at work, I really,
really value pool as my means of feeling good, for a little while. The game itself, with all it's challenges and experiences would be enough, then add the camaraderie of both my teammates and my opponents. We're all friends, at least while we are at the pool room. I value the social environment as well as the pool playing, as a result I look forward to pool an incredible amount. So I put a lot into it, and it means a lot to me. That's probably at least one part of why I get frustrated so easily.
I have gotten myself into a situation where taking time off isn't simple. I am the captain of one team, and the co-captain of another. And the good news is that at least one of those teams has made the playoffs each session for the last couple of years, so there aren't any "off" weeks from league. A victim of our (limited) success! Ha! Yes, I can and have skipped a week every so often, for some family or work reason, and so I can again. And I probably will. But I gotta pick my spots, and right now isn't one of those spots. (End of season next week, playoffs, and states after that.) So while that is instinctive to do, and probably would help, I won't be doing that for another month and a half or so. Yes, a great idea, and yes, I shall do so when I can.
Randy, you are absolutely correct that my PSR needs a lot of work. I was thinking about that earlier today, while I was sitting in a waiting room. (For an eye doctor appointment, with a new Eye Doc, who COMPLETELY understood the issues I was having with my bifocals while playing pool....I was so thrilled! She knew EXACTLY what was going on and described it to me before I could give her all the details. Yes, she wrote a script for new bifocals AND dedicated pool glasses, yay!) I have read about PSRs here a lot over the years, and have made a small effort to refine it. Today, I put some more thought into what I need to do to really set that in motion, and once I get that stuff together, I'll check back with you folks. Thanks, Randy.
Gambling....I get it. It's long been a part of the culture, and I'm sure that doing so will refine how a person performs while under regular pressure. Sorry, if that's what it's gonna take, I won't ever get past it. I don't have anything against those who want to gamble, but it ain't me. I simply cannot afford it, nor do I want the hassle of setting up games and all that goes with it. Don't worry about that with me, Maniac, thanks.
"The easy shots'.... Lou, CreeDo and Spimp, I agree with you . Any shot can be difficult, and can be missed (as I have proven repeatedly this past week) and they all need to be approached with the same level of attention. I believe that is partly responsible, without question. Still, I know that I wasn't hurrying, I took my time on all of them. One was BIH on the 8-ball, how stupid is that? (It was on the rail on the right side, so I had to set it up to cut it down the rail....should have used a bridge and worked down the rail. Poor choices, poor execution. Major embarrassment.)
Another was a 30 degree cut on the last ball before the 8-ball into a corner pocket, after a 5 ball run. Cue ball 2 feet away from the OB, which was 6 inches from the pocket. Probably overthought the leave for 8 and didn't pay enough attention to the shot at hand. Would have tied the match hill-hill, against a clearly better player.
Last night, 4 ball run to get to the 8, left myself good shape for a 2 foot, slight cut into the side. Takes talent to rattle a side pocket....again, would have tied the match hill-hill against a better player.
You folks have given me lots to think about, and I really appreciate the fact that you listened to my venting, which sounds too much like whining and feeling sorry for myself for my taste...and I apologize for that. Thanks again, everyone. This too shall pass, and I will be back at'em again tomorrow night!
P.S. I got no problem with the beer and Jack suggestions, either!

Though I use them in moderation until after I play. And the way I've been playing lately, they have been most welcome after my matches!