My best friend may never talk to me again
UPDATE: It's final, she's being sent to the hospital after finals, apparently. I don't know if she'll come back, or if she does, I don't know if we'll ever talk again.
Recently, my online best friend has been going through a lot. I've known them for 5 years now, nearly 6, and I'm so scared to be without them. I don't know how to handle it. They have mental health issues they haven't been able to resolve, and it only keeps getting worse. As a result, their mom is threatening to either call a psychiatrist or send them to a hospital. The issue is that they don't want that help at all.
If that happens, they'll probably rarely talk to me again. Actually, even if it doesn't happen, their poor mental health will probably strike and cause the same thing. Then, they'll delete and disappear from every social media I know they have. They might even block my cell number too. My birthday is next month and I might have nobody close to me celebrate with, because I've never had many friends.
I just need some words of comfort or anything, advice to move on, maybe? It's so hard, I'm someone who's very emotional and clings onto any small memory of everyone I've ever loved/appreciated.