Anything you can feel in your waking life, you can feel in your dream life, because both our created by your brain. The only difference is in waking life, the brain uses stimuli from the environment. You don't need to expect pain for you to feel pain in dreams. For example, I once had a dream about just my hand. And every two seconds everything would go red, and I would feel pain in one of my fingers, and then the next, and so on, until I woke up, with an aftertaste of the pain. I have felt pain multiple times in dreams, but never pains that were unbearable, only just uncomfortable. I wouldn't worry about it. You probably won't ever feel excruciating pain. I've never heard anyone say they have, although I'm sure it's within the realm of possibility.
Also, although people often talk about confusing reality and dreams, I don't think it truly has ever happened to anyone. You always know when you are awake. Sometimes, real life might remind you of dreams, or have a dreamy feeling but you still know you are awake. Also, you might forget if a memory is from a dream or real life, it's happened to me, but it's rarely ever important, and you will rapidly realize it was just a dream.
Both of these fears are not to be worried about.
Inception was a great movie, a great science fiction, with its created world and new physics. Dreams work nothing like Inception. You don't have an architect construct a world, no one dies in dreams, there is no such limbo, dreams are much less stable, there would be a lot more abstract content. There are no dreams within dreams. Although you can dream of dreaming within a dream, you are not in a "deeper level", you are just in the same dream. It's like reading a book. Maybe the character in the book goes inside another book and then into another one, but in reality, it is all happening in the same book. There are no other book levels. It's only part of the story.
Even Totems are irrelevant, because even if dream sharing exists, I really don't think you could take this object of yours out of your pocket and check if you are in your own dream or someone else's dream.
Anyways, I really enjoyed Inception, I wouldn't take it as a documentary though

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