I am sorry to hear about your situation. I am in the Dallas TX area, and there is a great set of doctors here. Message me if you would like their names and number. I would have to say that having someone close does have its advantages.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .