After kids reach the age of 18, you are no longer legally responsible for meeting their needs. So, do what you want or don't want. If they are mean to you, then they can suffer the consequences in a way. (I hope that doesn't sound too harsh.) You do not have to provide them food and shelter.

If you are dealing with the empty nest, then there are ways to handle it, such as getting involved in other things, as your health allows. I do belong to a social club IRL and volunteer when I can. I also have a kitten I treat like a baby!

But if you do really feel like you need some hospitalization, then, by all means, dear one, talk to your doctor/therapist about it. Okay?