I think dreams can def induce n but you may have also been overheated in your sleep, thereby causing the n and dream. Its a cycle.
Do not read pro ana sites and fast, please. Nope. Nope. Not good. I am an EPE (extreme picky eater) and only eat about 15 different things, but I try to get in 1500-2000 calories in a day because I am so skinny. It is not a way to live. I hate it.
Dismiss the dream as a fluke. Not related to anything except fear, unconscious thoughts, etc. You are fine.