I saw an interview with him just hours after the crash. He said once he was cleared from the hospital, he wanted to get back with his team at the track. He said he was fine and he kept it in his mind that the car would stop flipping eventually. He did say the car did a few more turns than he thought was possible though.
The main reason he wanted to get back to the track: to show his team he was okay, so they would focus on getting the backup car ready. Because he had enough owner points to qualify 40th for Sunday's race anyways, and he will be racing!