I'm going to share something from a book I cannot say enough about, so I won't.
But I will say this: in the moments you are happy, just tell yourself that. Don't clutch them, just acknowledge. Don't try to recreate, just be.
We Took To the Woods, Louise Dickinson Rich:
"It amounts to this. 'Is it worth-while to live like this?' is a question that I never ask myself under fair conditions. I ask it only when exasperation or discomfort or exhaustion pre-determine No as an answer. That's about ten times a year. On the other three hundred and fifty-five days of the year, I don't question anything. Happy people aren't given to soul searching, I find. Revolt and reform, whether private or general, are always bred in misery and discontent" (p. 320).