The pain over the first 3 days was definately the worst pain I've ever felt. Especially in the mornings when your first wake up, you have 20 minutes of agony until the next dose of painkillers kicks in and the drops actually start to re-lubricate your dry eyes. They say plan on being out of commission for a week, which is about right. I couldn't do anything (including watch tv) for the first 2 1/2 days. Sleep is your best friend.
They gave me two drugs, one of them was vicodin, which did WONDERS for the pain. I'd pop two of them at a time (I'm a big enough guy that two was an appropriate dose) and within a half hour the pain would be gone. It'd give me a headache if I tried to focus on anything though, so it just made it easier to sleep. However, you can't sleep for 3 days straight, which is why they gave me the second one. It was technically an anti-nauseant, because apparently some people get sick from the disorientation. I didn't ave that problem, but this drug had a "side effect" of being a major sleep aide. I napped during the day, and took one of those every evening, it worked out nicely. I crashed at a friends apartment during the 3 days, so even though I was sitting there with my eyes closed all day, I at least had people to chat with during the few hours I was awake.
After the first 3 days, you'll have dry eyes for a few months. With PRK just after day 3 or 4, your vision will cloud up big time as the outer cornea heals up and forms a seam, which smooths out over about 10 days. Even with that, I was cleared for driving (test 20/40 in both eyes) on day 10, and had been able to do most normal daily activity by day 4 or 5.
One occational thing that I'm really glad my doc warned me about. Your outer cornea is very delicate for the first few weeks. The new tissue occationally "sticks" to your inner eyelid, and a few cells will get torn off. The actual damage is negligible, and it doesn't affect your vision, but it hurts worse than anything else you'll have felt up to that point. It usually happens in the morning when you are jolted awake suddenly (alarm goes off, eyes shoot open), and goes away in ten minutes. But yea, all in all, the pain is part of the process. As the saying goes, "you don't have to get used to it, you just have to deal with it."