I think it's fine for you to tell people you have a chronic illness if you don't want to go into detail... it's completely up to you what you disclose and to who.

I'm sorry you feel so isolated at home, I guess it would be hard for you to communicate what you're going through. I don't know if this is a good idea or not, but since you prefer the text medium, maybe you could write a letter or poem to the family member you feel closest to and express yourself that way? If they knew what was really going on, maybe they'd behave differently.... just an idea though, I've never been in that situation, so not sure.

I'm open to PMs if you ever need to talk,
Meander