Oh wow, Michael. Have you gotten him off of this food already? If not, I would right away. It sounds like he’s having some true allergic reactions.
Personally, I believe that one of the problems with Orijen is that their recipes are so complex, it would be hard to know what exactly were the problem ingredients. Right now, you’re still on the verge of needing to feed a food with controlled Calcium and his being fully grown and it not being the concern it was during his growth phase.
Either way, I think I’d work on starting to figure out what his allergies are. I’d probably start with a limited ingredient food, like Nature’s Variety Rabbit (which she has an appropriate Calcium level for a LBP) and is a protein that he wouldn’t have been eating with the Orijen.
And then, it’s entirely possible his allergies are environmental. Lawn applications, fertilizer, pesticides, floor cleaning products, new flooring, detergent, etc.
Just in case you need it for reference, here’s HDM’s most recent list of 4 & 5 star foods with appropriate Calcium levels for LBP’s: https://docs.google.com/file/d/0BwApI_dhlbnFTXhUdi1KazFzSUk/preview
