Continued debate in this thread doesn't seem very productive to me, since all of our disagreement seems to come down to differing sets of moral intuitions / terminal values.

You're probably right.

EDIT: However, I do think you should consider if your moral intuitions really are different, or if you've somehow shut some important intuitions off by use of the "make anything arbitrary" rhetorical strategy I described earlier.

Also, I should clarify that while I disapprove of the normative conclusions you've drawn from personal identity skepticism, I don't see any inherent problem with using it to improve your mental health in the way you described (when you said that it decreased your anxiety about death). If your emotional systems are out of control and torturing you with excessive anxiety I don't see any reason why you shouldn't try a mental trick like that to treat it.