Death is a Dream, by E. C. Tubb

I enjoyed it. It's not a great book, but I enjoyed it.

Brad Stevens takes the Long Sleep, expecting to wake up in a few years when his cancer can be healed. Instead, it's hundreds of years later and he awakens to find a world completely changed after a nuclear catastrophe.

The new world he finds himself thrust into is brutally transactional. Those who cannot pay their debts are sold into literal slavery. Stevens finds himself saddled with the debt of what it cost to revive him.

What's worse, the world is strictly run by various guilds and trade associations, so it's not easy to get a decent-paying job. Some shady folks try to hire Stevens because he has some knowledge of nuclear physics, but he refuses to help them build a bomb, so he's reduced to manual labor.

After various shenanigans, Stevens ends up running with a shady relic-hunting outfit. With his knowledge of the London Underground, they manage to travel beneath the surface (avoiding the hard radiation aboveground) and emerge in the downtown zone where they ransack some jewelry stores. It's a bizarre sequence.

And in the end, it turns out Stevens isn't cured of cancer after all. Those who woke him up assumed he was suffering from radiation sickness and treated him for that, but his cancer is still there and still as untreatable as ever. He goes into the Long Sleep again.