I have suffered muscle pain ("myalgia") for the past 36 years since the accident. Every day, as you said. A few years ago I began being prescribed opiates to manage the pain (Oxycodone, Norco, Tramadol). I have been through withdrawal twice, the second one being last week.

The pain is not psychological, although it may very well be "in my head". I believe the TBI lowered the pain threshhold in my brain, causing it to mistake ordinary somatic impulses as excrutiating pain.

Only one thing mitigates the pain, and that is opioids, whether pharmaceutical or released from the brain as endorphins. I have had luck using exercise to trigger natural endorphin release, though this is not available to me when my migraines start flaring (they've been good the past couple months). I hope to continue having luck with this.

Good luck to you, too!