I can't go to therapy currently.

Look into online therapy, and support groups. There are also help-hotlines and chats where you can talk to people.

As I said at the beginning of the post, this is fully long distance. Completely online, currently.

Long distance can mean plenty of things. Lots of people meet in real life and then are forced to be long distance, others meet online, and meet up in person.

All of the relationships I've referenced to within the post (aside from my late fiance) have taken place in VRChat as well. I also currently have no friends irl, so all friends mentioned in this post are from there as well.

Yeah, you really should try to socialise more in person. It's extremely concerning to hear that your mental health issues are getting worse and that you have zero support network in real life.

Online is nice, but it's not exactly the same as reality. So many people click online, but don't actually match in person.