These are anti-epilepsy drugs such as valproate, carbamazepine, lamotrigine, phenytoin, gabapentin, and
pregabalin; muscle relaxants such as clonazepam and
baclofen; tricyclic antidepressants
such as carbamazepine, amitriptyline, and nortriptyline.
So ask your doctor to try these combinations. Something may click. Pain pumps can be helpful but they have their set of problems and you may need to keep increasing the dose. So, a combination therapy always works best.