If you're in constant pain that probably isn't helping your mood any, and I think that's normal.

Did anyone counsel you on how to taper your pain meds? You mentioned OTC but if you were previously on Rx as well, and if you didn't transition properly that could be a factor. (I'm not an expert, but when I was injured it was not my Dr., or nurses, or even my surgeon dad who told me about tapering; it was just a dear friend who shared her own experiences from multiple surgeries).

I was lucky with my injury in that light walks, while exhausting, resulted in less pain than sitting and doing nothing.

As another coping strategy, I think it helped that I was going into my last year of grad school, so my brain had plenty of stimulation and distractions from the pain. An active brain burns calories too! Perhaps delving into a less strenuous activity? Could be anything -- learn a new language, some kind of craftwork (if your hands are okay? I don't remember the specifics of your injury), whatever might feed your soul during a rough period.

Good luck with your Dr. follow-up!