Got a few for ya, but they're Sam, not Jared (because it's easy to comb through ohsam:

Time Out, (http://de-nugis.livejournal.com/81360.html) by de_nugis - I love everything she writes. Period.
Testing the Strong One, (http://familybizness.livejournal.com/10511.html) by familybizness - Super schmoopy; is Sam/Cas, but not blatantly
On a Roadtrip with my Brother('s Angel), (http://mamapranayama.livejournal.com/57452.html) by mamapranayama

(I get migraines too, so I sympathize!)


Edited 2014-03-18 05:36 pm (UTC)

Knock Three Times If You Want Me by cherry916
Summary: Jared has a headache, and it's just getting worse as the day goes on. The fact that he was Mr. Grumpypants this morning should have been Jensen's first clue...

http://cocoplumb.livejournal.com/5775.html?thread=66703#t66703

Unfortunately, it's very hard to find migraine fics for Jared (I've tried a lot and would be super excited to see anything rec'd)

However I do have some for Sam (https://delicious.com/cherry619/migraine!fic) I know it's not the same thing though. I see someone already rec'd my migraine fic about Jared even though it's for a comment fic meme.