“As pain becomes chronic, it is increasingly associated with activity in the affective and motivational systems tied to avoidance and less closely tied to systems encoding nociceptive input” [1] I’ve been on the slippery slope of chronic pain. Minor post surgery issues caused me to change my routine and avoid certain activities which only exacerbated the issues, which led to more avoidance. Eventually I couldn’t walk…
Pain is a legitimate diagnosis, though.
I deal with fibromyalgia pain. When I first developed it, I pretty much avoided doing anything, and really that was the opposite of what I should have done. There's no "recovery" and really no avoiding it; all I ended up doing was letting my physical condition weaken to the point that even normal activities were painful, so I was hurting for two reasons.
Treating the underlying cause of the symptom, and training to avoid behaviors that exacerbate the symptom is the real key.