Struddled pot, everyone folds and we wake up with AhAc @ BTN

Stacks
BTN - 74$
SB - 68$

Preflop:
Hero @ BTN opens w/ AhAc 6$
SB vill calls, BB folds, Struddle folds.

Flop:
QhTs8h
SB checks, we bet 10$, SB calls.

Turn:
3s
SB donks 15$, we just call (?)

River:
Jh
SB all in 37$...

What we do here? The line is super spewy I just don't know much what to do when he starts donking at turn, I think he is trying to make me fold better hands but then again that turn doesn't change much, only spade draws ok but don't think this specific villain would do that.

Please explain me what I could do better here, including turn and river action, thanks!