Same thing, I was a long way back to start and as soon as they hit the stage everyone rushed and I had to keep up, so within 10 seconds I was like 5th row. They got maybe 30 seconds into their first song before they had to stop to let people up. I stayed up for 10 minutes or so, never going down, but helping a ton of people up. When they stopped again to let the crowd up I actually had to piggyback a girl out of there, which was fine cause I was leaving myself.
I stayed in the back and watched the rest of the set from there.
Heat and all the whole thing would have been bearable, if not for a neverending line of crowdsurfers weighting down an exausted crowd.