My 15 yr old son has this.
In the space of 3 months he's gone from a 'normal' teenager, playing rugby, out with mates to wheelchair bound.
He began complaining of a sore back, then hips, then knees, then ankles.... day by day a new part of his body hurt.
The part of his brain that controls pain signals has basically malfunctioned. His nerves send pain signals to his brain constantly & his brain allows them through.
Pain killers don't work as his brain doesn't recognise them, they are designed to stop the signals going through but his is basically an open door for want of a better phrase. Before diagnosis he was on morphine the lot, made zero difference!
Even touch, a fabric or a breeze his brain can interpret as pain.
He cannot walk more than a few steps & even that is agony.
Hes had every test possible Inc 3 MRI scans. Everything has always come back normal, it's so frustrating at times.
We have now been referred to the Bath Pain Clinic & are awaiting a rehabilitation stay in the new year.
Unfortunately there's no cure but they teach you to cope/manage & find a way to live life with the pain. A lot of his treatment will be therapy (through he does have hydrotherapy etc too)
I completely understand how awful it is to watch someone you love in so much pain. There's nothing worse than watching my own child in agony every minute of everyday & not being able to do a damn thing about it!
Ask for referrals to pain clinics, they are the ones with the specialist knowledge. Usually you have to go through all the other treatments/medications 1st though & all other causes ruled out.
Feel free to drop me a private msg if you like. We are in the thick of it with upcoming treatment but I have a lot of experience in the process to getting the diagnosis.