Hi Annie,
I have felt a lot of good feelings that are reproducible, and I'm sure good feelings can be learned. Just rehearse! Rememmber what it was like when you had that feeling, and intesify the feelings, make the internal images bigger, brighter, more colourful, make the internal voices louder, more resonant, and let the feeling flow, and double the feeling, double the flow, and start again, make the images more bright, and so on.
I think I've answered my own question ;-) ;-) ;-)
Next empty moment I'll start rehearsing!
I might add that somehow I feel already deeply connected to you, Annie. Our experiences are so similar.
-purjo