200nl. 2 river decisions

1. Villain may be tilting a bit. Earlier I won a coinflip to stack him. I was 3-betting him a lot and he 4-bet 99 and lost to my AQs. He reloads and 3-bets a couple of my button opens and seems to be playing more aggressively. Then this comes up. He insta-checked flop. On the river I'm a little worried about getting value-towned by Ax, but his bet sizing seems bluffy. Obv my hand is somewhat face up.

PokerStars No-Limit Hold'em, $2 BB (2 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($249.50)
Hero ($413.50)

Preflop: Hero is BB with Qhttp://www.flopturnriver.com/phpBB2/...miles/club.gif, Qhttp://www.flopturnriver.com/phpBB2/...iles/spade.gif.
Button raises to $6, Hero raises to $22, Button calls $16.

Flop: ($45) 2http://www.flopturnriver.com/phpBB2/...es/diamond.gif, 8http://www.flopturnriver.com/phpBB2/...iles/spade.gif, Khttp://www.flopturnriver.com/phpBB2/...iles/heart.gif (2 players)
Hero checks, Button checks.

Turn: ($45) 4http://www.flopturnriver.com/phpBB2/...iles/spade.gif (2 players)
Hero checks, Button bets $32, Hero calls $32.

River: ($109) Ahttp://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
Hero checks, Button bets $88, Hero ??

2. Only played like 30 or so hands with this guy but he was very aggro. 3-betting a bunch pf and c/r'ing a lot of flops. On turn I felt like shoving just folds out worse hands. On river I'm very confused. His line obv looks very bluffy, but I'm not sure if he is capable of shoving the 8d, Td, Jd.

Full Tilt No-Limit Hold'em, $2 BB (2 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($228)
BB ($245.30)

Preflop: Hero is Button with 6http://www.flopturnriver.com/phpBB2/...iles/heart.gif, 9http://www.flopturnriver.com/phpBB2/...iles/spade.gif.
Hero raises to $6, BB calls $4.

Flop: ($13) Ahttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, 6http://www.flopturnriver.com/phpBB2/...es/diamond.gif, 4http://www.flopturnriver.com/phpBB2/...iles/heart.gif (2 players)
BB checks, Hero bets $8, BB calls $8.

Turn: ($29) 9http://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
BB checks, Hero bets $21, BB raises to $64, Hero calls $43.

River: ($157) 8http://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
BB shoves for about a psb, hero???