It does sound like a food allergy as others have also posted. It can make them so itchy. There are some diets out there for cats that have allergy problems like Hills Z/D that you can get at the vet clinic and Medi-Cal Hypo-Gastro. You could try him on it for a few weeks and see if it helps. They say that a true test is to feed it for at least 6 weeks and no other food or treats in between but you might be able to see some relief sooner. If you do switch him over, you might want to mix a bit of the new food in with his regular food and slowly weed out the old food so he's only eating the new stuff. That way he won't end up with an upset stomach from the diet change.

Quote Originally Posted by LionHart View Post
Not only the biting and scratching, but when we’re sitting down he will go from me to my room mate back and forth. Some times he acts like something’s after him, running back and forth, twitching as though something’s crawling on him. He will do the same thing the same way over and over in a pattern until he tires himself out, then he sleeps like a little angel.
This part kind of made me think of blocked anal glands. My cat Stinky has been blocked once before and she was running around like she had ants in her pants. She was very irritated and when I tried to pick her up she was angry which is not normally the case. She also scooted on the ground trying to get some relief. We had to take her to the vet to get them unblocked. It only took a few minutes for the vet and tech to unblock them.

But Junior P Tuna's scratching at the neck area makes it seem like it could be more of a food allergy.