@OneGrenouille I'm not sure what you mean. Like, I think you can just say it unless you're trying to segregate it from other things you post, but your profile pretty clearly indicates that chronic illness is part of your story (I assume that's what you're referring to about "things not going great").
If you're looking for people with similar experience, you can also try creating a group -- guppe groups, I think you can just @ your desired group name and it's created automatically -- and start posting to it, tagging, maybe talking about it in your other communities.