Sounds like he just needs lots of love and attention.
Like Sparky, Raini and Riley said, I'd find someone willing to work with him who has the spare time and patience to deal with his spooking and lack of confidence. Put a flyer up in your feed store or somewhere that you know a good, understanding horse person would see it. Someone needs to get him used to being handled and loved as often as you did before you went off to school.
Do you know anything about his past? Could he have been beaten or abandoned for months at a time? It's likely this behavior is tied to some sort of past experience.