Welcome to the boards!
How many mg of hydrocodone does this dosage amount to?
Body aches are very much a symptom of withdrawals from opioids. PAIN in general, actually.
Along with watery eyes, fever and all other attendant flu-like symptoms, depression, nervous and unproductive energy, unexplainable states of panic or near-panic, insomnia, anorexia, frequent yawning and sneezing ...
After year on hydrocodone, even in (what I'm guessing amounts to) a pretty small dose, and without any sort of 'tapering' toward the end, I'd bet you'll experience all of these symptoms, but they should all be relatively mild, and they should be over pretty quickly. Just pretend you're sick with the flu for a few days, and it shouldn't be long at all before you're right as rain!