The double came just days after his red card at Real Madrid.
"That's as low as I've felt just because of the sheer importance of the match," Crouch said. "It was the quarter-final of the Champions League at the Bernabeu against Real Madrid. With all those things put together, it was very disappointing.
"I watched the game in one of the referee's rooms with Rafa(van der Vaart), who came off at half-time.
"It was really frustrating. With each goal that went in, it felt like I had cost the team."
Crouch revealed that he was so desperate to make up for his red card that he almost had to resort to begging Redknapp to start him on Saturday.
"I was dying to play," he said. "I was thinking of saying (to Redknapp): 'Please, please, play me' to try and make amends and help get three points.
"I told myself before the game: 'Don't do anything stupid' and I scored a couple of goals so thankfully it worked well."