Valuebet gone bad - so annoying.

[Mossberg]

this is probably really simple but I'm stoned and this hand is bothering me.

villain is 52/6.5 over only 30 hands of 3-4 handed 2/4. He has seemed very aggressive, seeing a tonne of showdowns and winnings lots in a hurry. We haven't really played any pots together up until this point.

Blinds: $2/$4
3 players
Converter

Stack sizes:
Hero: $376.00
SB: $795.50
BB: $951.30

Pre-flop: (3 players) Hero is Button with A[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img]
<font color="#cc0000">Hero raises to $16</font>, SB calls, BB folds.

Flop: A[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img] ($36, 2 players)
SB checks, <font color="#cc0000">Hero bets $20</font>, SB calls.

Turn: 8[img]/images/graemlins/spade.gif[/img] ($76, 2 players)
SB checks, Hero checks.

River: 2[img]/images/graemlins/diamond.gif[/img] ($76, 2 players)
SB checks, <font color="#cc0000">Hero bets $38</font>, <font color="#cc0000">SB raises to $300</font>, Hero ???