Is this a push or just a 4bet? If so how much?

PokerStars No-Limit Hold'em, $2 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($121.25)
UTG ($108.40)
Button ($200)
Hero ($607.80)

Preflop: Hero is SB with 6, 6.
2 folds, Hero raises to $8, BB calls $6.

Flop: ($16) 5, 6, T (2 players)
Hero bets $8, BB raises to $22, Hero ??