Middle Pair Hand

I am looking for advice on this hand and how to play middle pairs in general I think its a pretty large leak in my game.

Multi-table tourney, PP, maybe 500 or so left of 3500.

Blinds 75 and 150...
Hero's stack (5062)
Villan's stack (6662)
Tourney avg approx 3000
Moved to the table 4 hands ago, so no reads

Hero in Big Blind 8 :club:, 8 :heart:
4 folds.
Villian raises (300)to 300
MP2 calls (300)
MP3 calls (300)
fold
SB calls (225)
Hero calls (150)... thought about re-raising but that seemed to be overplaying my hand

Pot 1500

Flop: 3 :club:, 7 :diamond:, 7 :heart:
SB checks.
Hero bets 1000... should I have pushed here? if last to act and checked to me probably would have pushed
Villan raises to 2000
MP2 folds, MP 3 folds, SB folds
Hero calls (1000)... thoughts on calling?

Pot: 5500

Turn J :club:

Hero checks. Is it worth a small bet to feel out?
Villan bets (3100)... so hero is all in if he calls
Hero folds.