[Nick C]

a) I pretty much automatically raise AJs UTG. Sometimes I raise AJo UTG too.

b) I would raise the flop to put more pressure on Button, who could have a hand that's worth calling one bet but not two against yours.

Unfortunately, when BB 3-bets, that does probably indicate that you're in trouble. But I wouldn't come to that conclusion based just on his preflop raise and his initial flop bet.

c) On the turn, my thinking would be that I'm probably behind BB, Button (who called three flop bets) is still to act, and the flush card just hit. I'm not assuming Button just made his flush, but it is possible, and I'm already worried that I'm losing to BB. Unless you had seen BB get out of line before, I think folding is probably best.