I also have noticed hormonal changes causing n* for me. And you're right it is a big help to realize that. For my it's the first 1-2 days of my TOM that hit me the hardest because I'm bloated and n* all at once all day. It used to make me anxious but now I just remind myself that I feel that way every single month on those days and I can at least get on with my day, continue to eat, and go out/travel through it because at least I have a reason for why I feel bad.