You asked, so I'll give you MY answer. Seems to me that what you really want and need, is to be the center of attention, and that this past month or so of totally bizarre and irrational behavior is just a means of achieving that. Yes, I know you have your little group of well-meaning but ultimately harmful enablers who are going to continue to support your role in "The Donny Pesce Show".
Like all good ENTERTAINERS, there is a strong exhibitionist tendency that is a positive for a performing entertainer. But when the public/professional entertaining stops, for whatever reason, that tendency is still there and has to seek other forms of expression. I think (and I'm no professional) that is what is happening here. I think the reason you are so furious with Uncle Dave is that he makes you confront the truth and down in your heart, you know every word is true. You throw out a LOT of 'attaboys' and 'your (sic) very welcome's' to maintain your following, but telling Mark to hit the road was a TEST too far, even for YOUR followers.
So, to your question 'What should I get next?'; how about a dose of humility, a semblance of normalcy. No need to respond to EVERY SINGLE post, whether or not you have anything important to say. YOU don't have to be the declarator of when a thread has 'gone south', especially if no one else is bothered and in fact, may even be enjoying the diversion.
Personally, I think you're probably a good guy, but there has got to be more to a person than the ability to sing in-tune. Hey, good people like Fran (and many others here) obviously see something good in you so my advice (which of course you didn't ask for) is, play up that 'good' side and play down the 'manic' side. I think we all know that what you're searching for has very little to do with keyboards. Yeah, for some of us, RETIREMENT IS A BITCH.......but not if you use it wisely.
chas
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"Faith means not wanting to know what is true." [Nietzsche]