First of all, you need to take a complete rest after having elbow tendonitis. You should not even move your arm as it will help you in pacing up the recovering process.
Stop doing any activity like playing games or doing exercises if you have got elbow tendonitis. It will create a bad effect and you will end up in increasing the problem instead of reducing it.
Take an ice pack and place your lower arm on it. Make sure your elbow is also on the ice pack which will help in relieving pain from the elbow.
You should keep your elbow on ice pack for about 20 to 25 minutes and repeat the process from two to three times on every day.
While having an elbow tendonitis, you should always wear an elbow brace or arm brace in order to support the tendon which will help in the healing process. However, make sure you wear the brace below the elbow because this is the part where the muscle connects to the joint.
You should use ibuprofen or aspirin which will work as anti inflammatory treatment and will help in reducing the inflammation from the elbow. If you are feeling severe pain then taking this medication will help in controlling the pain as well.
After a few days of such treatment for elbow tendonitis, you should try to move your arm and elbow in all directions in a gentle way in order to determine the improvement or healing process of elbow tendonitis.
Make sure that you do not move your arm quickly which can hurt you again by causing severe pain in your elbow and cause you greater harm.