You are very much not alone with this question, Starr - there are lots of people, here on Talking Sober and also in recovery generally, who ask this question.
There’s two layers (at least two, maybe more 
) to this:
- the surface layer, which is “am I doing what I should(n’t) be doing, or what I think I should(n’t) be doing” (this is the layer that bothers you when you see yourself slipping into the rabbit hole of “more and more” - you see yourself doing things you don’t want to be doing - and seeing that in action, bothers you; you wish it could change, you want it to change)
- the deeper layer(s), which is about who you are, and what you’re escaping, and how you can cultivate healthy acceptance of yourself, and find a healthy human space where you can live and make friendships and belong
What happens at the surface layer is always, always related to what’s happening at the deeper layer, and until you work on the deeper layer, the surface layer will remain the same.
All the above 
is something to think about and it’s worth looking into what you can do to find a space that works for yourself, a space where you can dig into some of those deeper things (there’s lots of resources for that here: Resources for our recovery). Digging into that will help settle some of the patterns that are bothering you. But you also mentioned a couple of practical things, and there’s helpful information about those too 
Here goes:
- Period pain: everyone who gets a period is affected by this in one way or another, and you are not alone there. There’s an active thread here where people share, and sometimes just having a space to reach out can help: Women's hormonal roller-coaster (there’s a wide range of posts here, some are about herbs etc which people have found helpful, some are other shares and sympathy etc)
- Taking prescribed (or even over-the-counter) medications: this is very much not only you, there are many people who are going through the same thing, you’re not alone. There are dozens of threads here about that (search “prescriptions” and “medication” and similar searches here and you’ll find a bunch). Ultimately it is a personal choice what you do and you know yourself better than anyone else does. At the same time, there is a principle that is common in recovery spaces and recovery groups: belonging. You belong. The only requirement for membership in many constructive recovery communities or groups is a desire to stop using. The details of how people communicate vary from person to person and group to group, but there’s a bigger purpose, a bigger mission, and that’s what keeps us united - that’s what keeps us being present, being there for each other.
You’ve been using substances for years, to fill a hole which is partly related to being alone, desperately alone. I think you’ll find that reaching out and connecting and staying connected in constructive spaces (like here on TS, or in a recovery group space that works for you) will help. If you stick with it and keep an open mind and try new actions and directions and perspectives, you will grow, you will find new things.
Don’t give up. You matter and you belong, always. The journey is hard - it is always challenging; that is the road ahead - but life never gives you a challenge that you can’t overcome. Dig deep and reach out, and you will find what you need.