I would also recommend getting your vitamin D levels checked. The normal range is far below what you should be at from my experience. 60-80ng/ml is an ideal range ("normal" from my lab is anywhere from 30-100) from what I've read. Can start supplementing and seeing if it helps.
I think 30 is the lab normal (and it was recently raised to 30 from 20) - though a lot of people are below that when tested.
It might be. But it could also be more.
Doesn’t mean that isn’t true, but I’d need more to be persuaded.