Pain relief - morphine, nerve block experience?

[sanita]

Hi, we are waiting for my mum's biopsy results but everything is pointing out to PC. My mum has been in a severe pain since October, now prescribed 10mg Morphine Sulfate x 2 day, and 10mg Oramorph to be taken as 5ml max 6 times in 24hr. This medicine is not helping, she is in a significant pain, she can only leave home to get more medicine. 

Can you share your experiences and medicines that helped with pain? Has anyone tried nerve block - A celiac plexus block? Thinking possibly to see if we can pay for it privately, to get it asap. Thank you