The Spaniard claimed that the fast-paced nature at the top level means he is never afforded time to take a break from the game.
Speaking in the club's official magazine, the Gunners man said: "The fight to switch off gets harder and harder.
"When you win, you think about the next game straight away. When you lose, it takes 48 to 72 hours to digest why it happened and then you begin thinking about the next game, which is usually just a couple more days away.
"I turn it over in my mind a thousand times [after a game]. That's because it's the biggest part of my life. I don't know how to turn it off."
The Gunners are currently fourth in the Premier League.