I don't know either of your specific requests, but boy have I got some angsty,powers!sam and protective!dean stories for you.

On the Dodge (http://candle-beck.livejournal.com/126381.html) by candle_beck: sam/dean, cowboys AU
Living on Flood Tides (http://infatuated-ink.livejournal.com/87956.html) by infatuated_ink: "AU after 5x22: Sam mysteriously returns from the cage and Dean thinks their problems are solved. Unfortunately, Sam is so shaken from his time in Hell that he can't—won't?—even talk to Dean, and when natural disasters begin to occur as frequently as they did when the Devil was walking the Earth, Dean realizes his brother may have acquired some of the angel's powers without picking up the ability to control them. In order to prevent Sam from hurting anyone, Dean finds a house as far from anything as he can manage and settles there to wait until the day Sam gets better—or until they both get killed by Sam's grace." (sam/dean)
And the Devil Makes Three (http://archiveofourown.org/series/9262) by killabeez: "Dean never thought he'd be the one living the apple pie life. There's a lot of things he never thought would happen." (sam/dean/ofc, postseries)
Synapses (http://archiveofourown.org/works/1323685/chapters/2755114) by lanri: "Sam never wanted to be the freak. This time, he doesn't have a choice in the matter. AU in which Sam doesn't have visions, he reads minds." (gen)
Storm Front (http://archiveofourown.org/works/221278/chapters/334012) by bewaretheides15: "In restrospect, it's the sort of thing that seems obvious, but in their defense,how many people - even people in their line of work - would really sit around and think 'huh, wonder if Sammy can control the weather?'" (sam/dean, preseries)
The Touch of His Hand (http://macbyrne.livejournal.com/70156.html) by macbyrne: "Sam is fourteen when his psychic ability manifests, in the form of powerful, uncontrollable visions that leave him incapacitated by pain. Fear of his father’s reaction to having a son with supernatural powers leaves him only one person to turn to: his brother Dean. As his feelings for Dean grow stronger and the visions take more out of him, both brothers will have to make decisions on what is important, and where you go when you have nowhere left to turn." (asshole!john, preseries sam/dean)
Nights on the Ceiling (http://fleshflutter.livejournal.com/146328.html) by fleshflutter: "Psychic powers are not all they're cracked up to be." (sam/dean)
The Vagaries of Disbelief (http://sevenfists.livejournal.com/10224.html) by sevenfists: "Um, let's call this an AU after 'Provenance.'" (sam/dean)
On a Wing and a Prayer (http://sinestrated.livejournal.com/44354.html)by sinestrated: "It's a slow, almost lazy night at the bar when the Winchesters walk in." (sam/dean, postseries)

Aww bless you for sending through all those links! I don't think I have read them all so will definitely keep me busy ;-)

Thanks again!