When Jackson was really bad with his allergies, he was crated he wore an elizabethan collar (cone) when I wasn't able to supervise him, to keep him from chewing on his legs. He probably hated it but... eh, what can ya do.
Also, according to my vet, it takes up to three months for a severe allergic reaction to clear the system, so I'm not surprised that 10 days didn't have much effect. I do strongly suggest getting your vet involved with this though, they're going to be the only ones who know for sure what's going on.
Though the allergy testing was expensive, for me it was worth it, if only so my dog healed faster. Good luck, I hope your pooch is feeling better soon.
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