I can only think of http://www.mangago.me/read-manga/katekyo/ Don't remember which chapter..?
One of my favorite chapter..
http://www.mangago.me/read-manga/yume_no_you_na_hanashi/mh/c004/
Honto Yajuu: http://www.mangago.me/read-manga/honto_yajuu/mf/192873/Vol7_Ch13/pg-1/
Stay Gold: http://www.mangago.me/read-manga/stay_gold_koi_no_lesson_a_to_z/mh/c002/
Both feature uke taking care of sick seme.
I'm looking for a yaoi manga (or at least a scene) where the uke takes care of the seme because the seme is sick (though it can be the seme taking care of the uke too) (=・ω・=)