@Rinel Much empathy, and all the hugs that are welcome.
I have had the happy week or two. I have. I know they aren't actually a myth.
It... kinda doesn't improve anything, though? I remember how I felt when I never had; I know how I feel know. The 'wow, it is possible and it exists!' is a boost that is absolutely counterbalanced by the deeper low of 'and it is not like that now at all'.
I think a lot of people that appear to be happy all the time are putting on a front, when it comes down to it. There's a lot of performative happiness out there, especially now in the age of social media. It's not... especially real, and a lot of it is pretty dang shallow.
(This is one of those 'the grass is always patchy shades of green and brown in everybody's yard' scenarios, at least in my personal view.)