When I first started taking hydrocodone, I recall that it made me very moody -- not while it was wearing off, but while it was dealing with the pain. The moodiness may be related to the return of the pain, or as straydog noted, we metabolize drugs differently and perhaps one secondary metabolite is affecting your mood.
There are various mood stabilizers out there -- lamictal and seroquil come to mind. If your moodiness is quite severe, they might be considered. My wife takes the former and finds it very helpful, also helps her focus and reduced anxiety.
When I was briefly switched to Kadian (time-release morphine), it completely knocked me out. Nucynta also makes me sleepy. By contrast, hydrocodone and oxycodone can wire me. So, if you do switch from the Butrans (vs giving it more time), Kadian, Opana ER and Nucynta are a few other options that might or might not work for you.
C4-T4 Scoliosis (disk degeneration, stenosis, narrowed neuroforamen, bone spurs), RT hip and SI joint damage from car accident. Also, pectus excavatum, supraventricular tacycardia and mitral valve prolapse syndrome.
Current meds: Ultram ER 300mg daily, breakthrough - hydrocodone 10-15mg, or oxycodone 5-7.5mg. .25-.5mg ativan as needed for sleep, Verapamil 240mg SR (for tachycardia). [/gray