Iniesta famously scored the winning goal in the 2010 World Cup Final before revealing a t-shirt with the message, 'Dani Jarque, always with us.' The Espanyol player died at the age of 26 on a preseason tour in Italy.
"You feel that it's not you, that you don't enjoy things, that the people around you are just people. You have no feelings or passion," he told 'Antena 3 TV'.
"You end up feeling empty inside and there is a moment that you realise that you cannot take it anymore.
"I had the ability to see that I needed to see someone to get out of that situation. The important thing is that in that period I never lost the spark."