[Closed] Tender elbow... became very painful then pain vanished

For a few weeks the tip of my elbow has been painful but only if I say propped myself up on it in bed or pressed on it with my hand. Thought I might have bruised it initially, but it's kept on for a while

Then earlier I was driving and knocked it aginst the car door and it became incredibly painful, even my shirt touching it was painful. Then as quick as it got worse it completely disappeared. Even when pressing on it with my hand it's no longer tender....

Anyone know what it could have been? Trapped nerve? Trapped tendon? I did think it could even have been a splinter or thorn. Really quite strange...