Alex just asked me to sing Una Donna and then Vedrai Carino. Haven't sung VC in a long time. Wow! I sang it the best I ever have. I impressed myself. Notes that before had seemed difficult or sounded screechy to me were easy and sounded nice, natural. I could feel the difference in how I'm now able to control my breath, relax my jaw and open. And a section that before I could never seem to get right just came out correctly. I heard myself singing it - it felt right and it sounded right. If I thought about it I would've lost it so I didn't think, I just sang.
Maybe the key for me is to have the listener bounce on a mini-trampoline while I'm singing. Oh and of course to put things away for a while to let my brain process them.