"It was a difficult weekend," Hamilton said. "I'm ninth, and we should have been much further ahead. So I'm very disappointed with myself.
"I blew it in qualifying and it was impossible to catch up. The radio failed in the race and I didn't know what the hell was going on. I missed my pit stop by quite a few laps. It was a disaster of a weekend."
Italian GP highlights: Sebastian Vettel wins convincingly at Monza
Hamilton now heads to Singapore for the next race on 22 September knowing exactly what he has to do.
"I basically need to win every race, which is the tallest order ever, but I can do nothing but try," he added.
"Our car was good in Hungary when we had higher downforce, and we'll have that going into Singapore where we can hope for some improvements.
"I hope we'll be strong, get some more wins this year. I wish it was a closer battle at the front. It's a shame it is like it is."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.