Chances are, you'll get sick of you're own thoughts after about 2 hours so make a playlist long enough for you not to get fed up with a certain song and listen on repeat. I find this is my number 1 remedy of keeping me sane.
2. Find something to keep you occupied
Do some over due homework, revision, anything that takes your fancy, NOT eating everything in your fridge. I have an mock exam this week so I split most of my time between that and catching up on art coursework.
3. Get out of the house
This may not be a good idea if you are really ill like puking everywhere...or live in a busy neighbourhood...you might get some questioning looks. But if none of those apply, go for a walk!! *GASP* Exercise, yeah, the 'E' word, you might find you enjoy it!
4. If all else fails, stay inside, grabs some snacks and have a movie marathon
At least that way, you'll be resting, not talking and occupied... if anything, that's probably the one that's best for you....
Hope this helps anyone in such a troublesome circumstance that they are nearly insane.