Hand vs. Negreanu on Day 1C

[CieloAzor]

I showed up at Negreanu's table with about 25 minutes left on Day 1C, just in time to see his 45s make a straight and bust some guy that overplayed JJ. The table is whining that Negreanu raises EVERY pot. The follow hand occurs:

Blinds 200/400, Ante 50
Button ~35k
Hero (SB) 22k
Negreanu (BB) ~85k

Folds around to button who raises to 1500. Button is an older guy who was complaining about Negreanu pounding on him, so my first impression is that he's a bit weak. I call with Qd8d and Negreanu calls as well.

Flop is Qs5h5s. I check, Negreanu checks, button bets 2k. I'm pretty sure I have the best hand...I flat call. I'm expecting Negreanu to fold now but he raises to 5k! Button agonizes for a minute and folds. What now?

So I'm out of position against a great player who could have just about anything. I'm not convinced I'm beat yet, but it's tough to see how I can get through the hand. What's the plan?