2 years of constant headache and muscle pain

My girlfriend has been struggling with a constant headache for 2 years now. It's accompanied by muscle pain in the neck and shoulders. It's taking its toll, mentally, emotionally, and financially. We've seen so any doctors both private and on the NHS. We've tried Botox, acupuncture, prolozone therapy, migraine medication, prescribed opioids, chiropractor, massages done for many months, neurologist, ent. She's run out of hope and I don't know how much longer she can cope. We can't rely on the NHS because anything they want to try has a waiting list of two years and going privately is difficult as we're both students and she can't work because of her constant pain. Just wanted to know if anyone had any ideas...

It is fluctuating constant headache, some days it is better than other but it stays at a minimum of 6 out of 10. She’s had an MRI done of her head and upper neck, and we’ve been told by two doctors that it is completely normal

Hi,
She’s had many session with PT and has done the exercises they have given her for many months now but to no avail. We also invested in a new mattress and an orthopaedic pillow. I’ve been massaging her trigger points for well over a year now and sometimes it can help calm down a flare up but not more than that.
Thank you for your kind reply