wanna puke on the river... should i call?

$0.1/$0.25 No Limit Holdem
5 players
Converted at weaktight.com

Stacks:
UTG ($25.00)
CO ($24.73)
BTN ($26.79)
SB ($25.00)
Hero ($78.77)

Pre-flop: ($0.35, 5 players) Hero is BB
1 fold, CO calls $0.25, 1 fold, SB calls $0.15, Hero raises to $1.25, CO folds, SB calls $1

Flop: ($2.75, 2 players)
SB checks, Hero bets $2.25, SB calls $2.25

Turn: ($7.25, 2 players)
SB checks, Hero checks

River: ($7.25, 2 players)
SB bets $5, Hero ?????????