SteveL, I wish I had your problem
Seriously, I wish I had been more frugal in my earlier years of working. As it is, I am not retired yet although I have gotten the FIRE and LBYM "religion".
Would it help if you spent not so much on material possessions or things, but on experiences that you would enjoy or find enriching?
For me, that would mean learning skills or pursuing interests, like learning to paint, to play a musical instrument, to do carpentry, or to make pottery; pursuing hobbies or sports; taking classes for fitness (yoga, Pilates) or out of curiosity (physics, history); or even going on a spiritual retreat.
It's already been brought up but if you were so inclined, it would also be a form of enrichment for you to help out others by donating to causes important to you or by helping people you care about. There are even "working" vacations to help the less fortunate here or abroad. (Even ER's need a vacation to vary the routine, right?)
I am echoing something that HaHa said once about spending on skills/interests that become part of you or your life--they are more lasting and are remembered longer than spending on knick-knacks or material stuff that quickly loses value ("bad investment", per Jay_Gatsby).
Edit: Oh, and I agree with unclemick on the feeling that possessions kinda possess you--you've gotta find a place for them, dust 'em, clean 'em, maintain 'em, count 'em, insure 'em, move 'em, haul 'em, store 'em, worry about 'em, etc. So if you're thrifty on buying stuff, maybe it's a good thing and you can balance that with spending more on non-material stuff.