It sounds like you already know this, but I absolutely think about all of this stuff!! I really enjoy thinking about all of the logistics. Haven’t given it nearly as much thought for growing scenarios since I’m not quite as interested about that side of things, but it’s a rabbit hole that I love on the shrinking side.
I don’t remember addressing sight issues with any of my characters, but I actually did acknowledge menstruation once. In that story she lived in a crazy fancy dollhouse that had a bunch of miniature supplies, including tiny tampons, and her giant was pressing his hand against her lower back like a makeshift heating pad and did stuff to help her out - drawing her a bath, getting her tea and chocolate. But I think otherwise it could go like you said, either the biology of the SW is disrupted from shrinking and the periods slow/stop, or she DIYs some supplies like rags to use instead.
It’s fun to me that you even mentioned this concern, because it’s absolutely something that I’ve thought about but would hesitate actually writing about, because I didn’t think anyone would want to read about it (definitely grew up with most men around me going “eeewwwww” any time menstruation was brought up in any capacity). But I eventually had a moment where I thought “you know what, this is our lived reality and would absolutely be a challenge if I was small, I’m going to address it, hopefully the dudes who read my stuff are cool with it” lol. I tried to take it as an opportunity to represent periods in a way that I haven’t really seen in media. I didn’t make her moody and pissy and unreasonable, she was just really tired and in physical pain. And he didn’t get all grossed out about it, he took it in stride and just wanted to know how he could help make her more comfortable. It was a surprisingly healing chapter for me to write haha.
As for other inconveniences - so while writing my latest thing, I knew the main character would be stuck tiny for super long term, so one of the ways that I planned out the story was by thinking “okay, what are the major things that a person needs - not just to survive, but to feel fulfilled.” These are the sort of things that came up that I then planned around:
-the basics (shelter and basic furniture, access to food and water, clothing, cleaning supplies, etc)
-accessibility (beyond the pure basics - like if she lives with a normal sized roommate it’s the ability to easily get around their living space and coexist together, or it’s ways his clothing could be altered to better accommodate her, or ways for her to feel more independent, etc)
-medical expert(s), for regular checkups but especially in case she gets sick or hurt
-mental health resources
-tools to help communicate despite her size (which might depend on how small she is)
-a social life
-a romantic partner (if that’s what she wants)
-a potential career/vocation
-hobbies!! (I love thinking about this one, I feel like it’s often overlooked) and just general entertainment
I’m sure there’s more that I’m forgetting right now. This is fun 