The purpose of this study is to investigate the use of a prescription drug called pregabalin (trade name Lyrica) in patients with head and neck cancer receiving chemoradiation therapy to see if pregabalin will 1.) help reduce the severity of pain caused by mucositis in head and neck cancer and 2.) to see if using pregabalin can reduce the amount of opioid pain medication that patients need for mucositis while receiving chemoradiation treatment. Mucositis is a word used to describe inflammation and ulceration in the treatment area. Mucositis is a temporary result of damage to the cells lining the mouth and throat by radiation and/or chemotherapy. Pregabalin is currently FDA-approved in the treatment of neuropathic pain for illnesses like Fibromyalgia and Diabetic Neuropathy. Neuropathic pain is a type of pain that occurs when nerve fibers are damaged or not working properly.