raised with 88, got re-raised. Now what?!

[proell]

Seat 5 is the button
Total number of players : 8
Seat 1: UTG+2 (2115)
Seat 3: CO+1 (345)
Seat 4: CO (1475)
Seat 5: Button (78)
Seat 6: SmallBlind (772)
Seat 7: BigBlind (745)
Seat 8: Hero (685)
Seat 10: UTG+1 (1785)
** Dealing down cards **
Dealt to Hero [ 8h, 8s ]
Hero raises (150) to 150
UTG+1 calls (150)
4 people fold...
SmallBlind raises (425) to 450
BigBlind folds.
Hero...?

any reason I fold this hand?
With ~800 in the pot at this point I can't see laying it down unless I am sure that this is an overpair, right?

I ended up folding because I was ITM on 3 other tables and got concerned with the player behind me. But looking back I think I probably should have pushed this. Thoughts?