I was in the hospital for my first four days, which made my quit a lot less stressful, apart from the whole "collapsed lung" bit. That said, I slept a lot, and I watched TV a lot. I tried my best to keep my mind busy. When I got home, I threw out every little scrap of smoking paraphernalia I could find. After that, I ordered a big bag of candy--Skittles, if I recall correctly--and used those for my oral fix. I let them melt in my mouth, rather than chewing them, for the most part.
Anticipate that you will not feel great, but if you can think of it as the sort of discomfort that heals you, I think that helps. Just like your muscles ache during a workout and that doesn't feel fantastic, but you know you'll be stronger in the long run, you can think of the headaches, insomnia, stomach upset, and anxiety as something to endure--or alleviate, if possible. If you are successful in passing through that gauntlet, the good news is that you'll never have to go through it again, so long as you stay quit.
Every little discomfort you face on your quit will get less and less intense as time goes on. You may have minutes that feel like hours and days that feel like years. Those are the days where it's helpful to stay busy, to avoid stress as much as possible, and be on your guard against the temptation to smoke. Eventually, the days will feel more like days again, and the minutes will pass, and you will feel less and less inclined to smoke. Then, you'll come up on a "first," and you'll feel like smoking again, seemingly out of the blue.
Here's an example for you: I recently had to go to the DMV to renew my driver's license. The last time I'd done that, I was a smoker, and I sat outside the DMV puffing away, waiting for my number to be called. This most recent trip, I had been quit for 16 months, but all of a sudden I felt like smoking again. Why? Because it was my first time in 17 years that I'd gone to the DMV as a non-smoker. You will experience a lot of those. First holidays. First family emergencies. First heartaches. It can be frustrating, but with each victory, it will be easier and easier to say "no" to those cancer sticks.
"If you're going through Hell, keep going." The way out is through. Put in the time, endure the pressure, and claim your victory. If you smoke, you won't have to face the discomfort of quitting, but you'll still stink, you'll feel the physical effects of smoking, and you'll have that worry in the back of your mind about every little ache and pain and bump and blemish that crops up, wondering if your habit has finally done you in. If you endure the discomfort of quitting for a little while, you won't stink, your body will start to repair itself (however slowly), and over time, you'll worry less and less about those aches and pains, for the most part.
Today's the day to make your choice, for today. Tomorrow, rinse and repeat. One step at a time, one hour at a time, one minute at a time, one second at a time.