[Solumina]

This may be a bit hard since you are a vegetarian but lay of the grains for a little while, you could have a problem with processing gluten, if it was causing you problems when you were very young then you may have associated the pain/discomfort with food in general and developed an aversion to eating. the inability to process gluten can screw up your body in a lot of ways, including psychological problems, though I haven't heard of any cases I wouldn't discount body dysmorphia as a result.