Writer's Block.

I think a shift in focus maybe in order. Instead of being concerned with it all sounding the same think of the big picture in your story. Is it a story involving a quest of some sort? If so what's the next step? Is it character and relationship driven? If so what challenges do they have to overcome to meet end goals? The list of things to think about in relation to the type of story your writing goes on and on and on. I've found if I try to refocus on what has me blocked in relation to the story or character, I ultimately get much farther.

Also, if I'm stuck on a specific scene that I know is going to take place in a specific type of setting, and I just am not sure how I want to write it... I surround myself with pictures relating to my setting or characters, clear my head, and just go for it. After all, your not reinventing the wheel, your just trying to tell the best story you can, and if it's not perfect so what? All yourself to make mistakes. Because the real work is in the editing process anyway. That's when your perfect little pearl gets to really shine.

I know it wasn't much of a pep talk, but I hope this helps.