Lost On The River

Every chance I've had of late to post here, I've instead chosen to play more poker. As a result, I've been accumulating a handful of post ideas and a number of tough hands, and hopefully I'll get them all out here before they drift out of my head (as things do at a rapid pace these days).

I had a pretty bad losing session yesterday. It was precipitated by losing AA vs. KK (AIPF)...I turned a little bit aggro after that, making way more hero calls that I normally do, and more bluffs too. All were ill-timed, and many were poorly thought out. But regardless, I had an inordinate number of tough or weird spots. Three of them are included here. In the first two, I was facing big river bets holding marginal hands. In the 3rd, I got myself into a tricky spot by 3-betting light from the blinds. Any feedback is appreciated...

Hand 1)

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter
Hero (MP): $95
CO: $21.80
BTN: $95
SB: $33
BB: $45.15
UTG: $103.65
Pre-Flop: Q J dealt to Hero (MP)
UTG calls $0.50, Hero raises to $2.25, 2 folds, SB calls $2, BB folds, UTG calls $1.75

Flop: ($7.25) 2 T K (3 Players)
SB checks, UTG bets $1, Hero raises to $5, SB folds, UTG calls $4

I basically ignore tiny donk bets and just treat them like checks, betting the amount that I would normally C-bet anyways. I would say it's commonly done when donks flop draws, using the stupid "juice the pot, just in case I hit" logic. What's especially nice (for me) is that it gives away information without affecting the size of the pot. But anyways, this is mostly tangential to the action.

Turn: ($17.25) J (2 Players)
UTG checks, Hero checks

River: ($17.25) J (2 Players)
UTG bets $14.50,
Hero?

I've backdoored trips, which is pretty well disguised, but all kinds of other hands have gotten there. What's my action here?

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Hand 2)

Full Tilt Poker, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter
UTG: $22.17
MP: $6.66
Hero (CO): $31.56
BTN: $9.11
SB: $40.23
BB: $33.12
Pre-Flop: A J dealt to Hero (CO)
2 folds, Hero raises to $0.85, 2 folds, BB calls $0.60

Flop: ($1.80) A 9 Q (2 Players)
BB checks, Hero bets $1.25, BB raises to $4.50, Hero calls $3.25

Turn: ($10.80) 9 (2 Players)
BB checks, Hero checks

River: ($10.80) Q (2 Players)
BB bets $9.50,
Hero?

You can argue that this is a fold to the flop check-raise, but I had position and was playing through a stubborn, tiltish phase. The turn and river cards make the action a bit more interesting, by greatly reducing the likelihood of a set of 9s or Qs. Not sure I can beat anything other than a bluff here though, right?

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Hand 3)

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 5 Players
LeggoPoker.com - Hand History Converter
Hero (SB): $50
BB: $50.90
UTG: $72.15
CO: $78.70
BTN: $50
Pre-Flop: K Q dealt to Hero (SB)
2 folds, BTN raises to $1.75, Hero raises to $5.75, BB calls $5.25, BTN folds

I would much prefer the Button to call, which he might do with a wider range that includes some hands that I beat. The BB has a strong range to overcall here. Stats would help...sorry I don't have them now.

Flop: ($13.25) K 6 4 (2 Players)
Hero checks, BB bets $7, Hero calls $7

Turn: ($27.25) 9 (2 Players)
Hero checks, BB bets $18,
Hero?