Headache after surgery

my grapefruit Size  tumour was remove from my brain 2 years ago. I have had  permanent pain ever since. I paid privately for a MRI scan and dr.

Told me i have nerve damage to live with it. 

I can't it hurt painkillers don't work pregabaline 25mg taking 3x2 time's they don't work.

What can I take? Help

Elizabeth