Arsene Wenger said he suffered during a summer he described as "the most disturbed since I have been here".
The Gunners sold Cesc Fabregas, Samir Nasri and Gael Clichy to Barcelona and Manchester City and have started the season in poor form, culminating in an 8-2 loss to Manchester United.
The Arsenal manager added: "In my job, you expect to suffer.
"That's why when I go to hell one day, it will be less painful for me than you, because I'm used to suffering."
The Frenchman added: "I could write a book about the summer. The book would be quite an interesting read.
"Not because of me, but because of all that happened. It was unbelievable."
Meanwhile, Wenger expects new signing Mikel Arteta to have an "immediate impact" against Swansea on Saturday.
The 29-year-old is set to make his Gunners debut, while fellow new recruits Per Mertesacker, Yossi Benayoun, Andre Santos and Chu Young Park could also feature.
Wenger said: "For us, basically, it is a new start. I expect Arteta to have an immediate impact - and Benayoun.
"They are players I admire for their technical qualities."
Wenger thinks the team's style will suit both men. He said: "They are mobile and technically gifted. That's the game we want to play so they should integrate very well.
"Their quality is not questionable. We have a good opportunity now to show that in the coming games."
Former Everton playmaker Arteta is understood to have accepted a pay cut to force through his £10m deadline-day move from Goodison Park.
Wenger cannot wait to see his new-look team in action as Arsenal aim to get the 8-2 thrashing at Manchester United out of their system. He said: "We start now and want to win a strong way."
With almost all of the first-team squad away on international duty following the morale-sapping defeat at Old Trafford, Wenger admitted the time away will have done them good.
"The players have something else to think about and that's the best way sometimes to get it out of your mind," he said.