Keeping in mind that the hospital was not deliberately trying to mess with you, your doctor should have noted your preference and your name should have been removed from whatever list they give to elders. You need to speak with the hospital administrators about this-not in the "I'm gonna sue" kind of mode, but in the interests of it not happening again to you or others. NO ONE but the patient should have a right to put religious information on ones intake information unless the patient is like 6 years old. The hospital liason committee or whomever needs to get schooled on the appropriate way to deal with people who are already in a traumatic situation. You don't harrass them about their religion or their medical choices.That should be out of bounds anyway! And the chaplains (often HIRED by hospital) should go to some kind of sensitivity training. That should NEVER have happened from the get-go.
I'm glad you are better. It might be a good time to remind your mom that you are not 6. If she knows you aren't really a JW, she should have respected that. If she doesn't, you might want to enlighten her.