A good remedy for the common cold, headache, or just about any illness cured by over the counter asprin... is just good old fashioned REST! Accompanied by a good book, and tall glass of pink lemonade of course.
If you are the more dramatic type throw in an ice pack too, if it makes you feel better. No matter what you do, make sure you unplug for one full day, keep a note book handy for new ideas, but leave the iphone, nook & laptop OFF! :)