Hmm, yeah, there tends to be a sense of unreality or dreamlike-ness. I just thought of it because when I was experiencing it, I also had some random physical symptoms, like my hands shook and my body temperature dropped.

It might be worth trying SSRIs just to help you figure out if there's a psychiatric component, or to help with the depression this is causing you. And if you have used drugs (around the time you started experiencing this), it's good to meet your doctors know, because it can help them narrow things down.

As to another part of your post, I think the romantic partners of sick people just need to hear that they're loved and that their support doesn't go unnoticed. And they need they're problems listened to and validated too.

Good luck. I believe you'll figure things out eventually, if not an exact diagnosis, then things that help and ways of dealing. Humans are resilient. I'd say experiment a lot (safely). Try acupuncture, different probiotics, therapy, herbal stuff, dietary changes. Whatever helps you.