The joints in my right elbow are hurting, what should I do to stop it?

Take a good rest, because your body must me only tired. Then take warm baths and do stretching exercises. Ask someone to massage the area for you. Anti inflammatory medication can help with the pain and, if there's any, swelling.

Are you right handed?
Countless thousands of people have neck, shoulder, arm, elbow, wrist, and hand pain from the way they sit and the way they hold the computer mouse.
It's often called tennis elbow because tennis players get it.
If you spend a lot of time on your computer, Answer below, and people will give you advice on how to sit.