Turtling is a term I use for when I close in on myself in a self-protective mode. I guess some people might call it nesting, but I avoid surrounding my areas with lots of clothing and blankets (I've done this in the past). Instead, I feel as if I've pulled into a shell and don't want to come back out.
I think it's different from agoraphobia (my BFF thinks differently, of course). Agoraphobia generally results from having panic attacks at different places until even leaving the house causes them, leaving you stuck. I don't feel as if I'm afraid to leave (although there is anxiety). I just feel safer inside my home.
When I do leave, I enjoy being out. When I've been out for a couple of hours, though, I start feeling like I need to be home. Luckily for me, it isn't the compulsion it was about 15 years ago. It's merely an urge.
The big problem seems to be making myself get out of my little womb.
I think part of it is the problem introverts can have when they've been excessively introverted, away from almost all stimuli. They become more introverted. When I read The Highly Sensitive Person, it changed my outlook and I learned that I'm not "too sensitive." But I do have to watch out for becoming so introverted I have difficulties having any stimuli at all. I don't even listen to music anymore.
Having reasons to go out, having people to see, having things I want or need to do: these would get me out and expand my stimulation threshold once more. Yes, it's been suggested I do some volunteer work that requires my physical presence. I forget to look for it. My current state of mind (or medicine) messes with my short-term memory. A lot. So I forget these ideas I have for helping myself get better.
I forget to do stuff I really love to do, such as write and other creative things. Here I am, more time than money, and I fritter the time away not creating a thing, not walking in beauty, not going to a museum or the zoo. I waste it huddled in my self-created womb, my shell, my bomb shelter.
I need to remember to look outside and see that there is no bomb, the sky isn't falling, and the sun is shining invitingly. I need to reclaim my authentic self and surrender my turtle self, because I can protect myself in other ways and do not need a hard shell to hide inside. I must remind myself that I gave up barriers when the walls of my keep broke into ruins inside my mind and my heart a few years ago when I felt great pain.
Vulnerability is the new strength. Try it on, self. I think it looks very good on you.