Feed the Beast

So I've been working hard for a while, to get some nice weapons to go visit the twilight forest. I did, except now I have perpetual hunger, and I died, in what I think was an entrance to a labyrinth. I can't break my grave to get my stuff back, it just pops right back with a wired yellow effect, the same every other block I try to break does, and the monsters don't loose any hears when I hit them. All of those problems are solved when I am in creative mode (except the grave, which is then destroyed, without giving me items. It tested that on graves that didn't have anything important in them.) But of course playing in creative isn't what I want to do... Also my mini map became rectangular and in the top center of my screen, I would kinda like to put it back the way it was. Can anyone help me?

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Thanks