I hear ya.
Shy bowel, like other mental health problems decimates your ability to earn money. And it usually comes with other mental health problems as well, and sometimes physical health problems like IBS etc which have a multiplier effect on the shy bowel. So it's a vicious circle. You need money to afford to rent a place of your own. But you can't get money because of the shy bowel and other problems disabling your ability to work; or hold down a job; or get high enough wages to afford to live alone, especially now with the cost of living crisis. So your mental health gets worse, which means you're in even less of a fit state to earn enough money to get your safe space...
I'll only share this because it might in some way help over the longer term. I don't know what country you're based in so it might be very different where you are. But in my case, pretty much the only route to getting my own place, my own safe space, was to go into a homeless hostel. (Of course, I told the allocating people that I could only move into a hostel if I had my own room which had its own en suite toilet. I can't remember if I mentioned shy bowel specifically or was a bit more general but they did find me a place at a salvation army hostel (who I have to say ran it well). I kept myself to myself and spent as much time away from the place during the day as possible.
Social housing allocation in the UK is based on a points system. If you get enough points you're eligible to apply to live in places that become available. As a single male, you're fairly low on the priority scale. Mental health problems don't score many points.
After 8 months in the hostel, I got a housing association place of my own, and whilst it's far from ideal, I'm very grateful for it simply from the point of view of having my own safe toilet.
That was fifteen years ago, and certainly in the UK, the pressure on social housing (whether it's housing association or council owned) has increased a lot so it might not be so easy, or it might take longer.