I have to get my wisdom teeth out in a couple weeks, so I sympathize with you fully.

For #1, have you read this one? Keepsake: http://indysaur.livejournal.com/24566.html

It supposed to be loosely based on Wall-E, which I haven't seen yet, but the fic is amazing.

#2 - Sam takes care of Dean in The Year of Letting Go: http://runedgirl.livejournal.com/32053.html

#2 - This one is multiple parts. Sam takes care of Dean, but doesn't find out something that is bothering him/hurting him until later in the story:

Part 1 The Ice is Thin: http://mona1347.livejournal.com/191373.html
Part 2 Underneath My Lucid Skin: http://poisontaster.livejournal.com/127580.html
Part 3 Until I Can See Again: http://poisontaster.livejournal.com/134716.html?style=mine

Hope there's something you haven't read here. Feel better soon.