Useless

Can I have an answer for each question I ask?

Is it many problems that happened on someone mean that person is useless?
Heart pain means useless?
Health problem means useless?
Lying whole day because of operation means useless?
Doing nothing after operation means useless?
Body part still pain after operation means useless?

Is anything is useful or helpful for the person above?
What can this person do?

Hope I can have the answer as soon as possible...