I believe this Saturday's episode of My Cat From Hell will deal with separation anxiety! It is a real thing and it seems that's what your kitty is suffering from. I think older kitties can have it worse. Now that you are home for the summer, observe the kitty. If he behaves eats normal, then I'd say that's the issue. Bengals will attach themselves to one person and it looks like that person is you. I think what needs to happen is the other people in the household need to be spending more time with your kitty. Play time, petting. He may get that already, but when you leave again in the fall for college, the anxiety will more than likely come back.
Jackson Galaxy has some holistic remedies and one is especially for separation anxiety. They are on sale for under $20 at the moment:
http://www.spiritessences.com/product-p ... remedy.htmIt may be worth the money to try it out and see if there is any improvement. However, I do feel that a lot more interaction from the rest of the family will also help. And, eventually, you'll graduate. Good luck.