Not sure that these fit exactly...

Dean solo, when Sam's at Stanford
Turn the Page
https://apocalypsos.dreamwidth.org/1286158.html
Dean gets a new hobby after Sam leaves for Stanford.

Land's End
https://www.fanfiction.net/s/3719763/1/Land-s-End
In limbo after Sam goes to Stanford and John heads out on a solo hunt, and short on cash, Dean takes a job that just may be more dangerous than the one he already has: crab fishing in the Bering Sea.

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Stanford era, hurt Dean
Crash
https://www.fanfiction.net/s/5825011/1/Crash
Set in the Stanford years. After a rough solo hunt, a hurting Dean camps out on Sam's couch. Sam's roommate notices a few things about Dean that Sam finds hard to hear.

Because of Houdini
https://www.fanfiction.net/s/5412180/1/Because-of-Houdini
Dean was born with cystic fibrosis, a chronic illness of the lungs. Sam struggles with juggling two lives. Something's killing people at Stanford.

Falling (maybe?)
https://www.fanfiction.net/s/5417294/1/
Dean experiences a serious illness (cancer) while Sam is away at Stanford and hides the leftover or recurring symptoms from him once Sam is back on the road. Then Dean collapses during a hunt...' Not a deathfic

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After School Special
http://archiveofourown.org/series/6861
John found it when he was doing laundry. When John dug into the bottom of Dean's duffel to get the last of the dirty socks that had been sitting in there, probably, since the last time John had caved and done the laundry, he found a roll of bills. Tens and twenties, mostly, held together with a black binder clip. It was close to five hundred dollars.

Do Dandelions Roar (Dean is taken when Sam is at Stanford, and includes your second request, but he is protecting Sam originally)
http://singer-salvage.livejournal.com/42273.html
Two years ago Dean disappeared. Now John and Sam have gotten him back. But how will the three of them deal with the unexpected changes his trials in the time between have effected? And what does a goddess have to do with the whole thing?