I'm sorry to hear that. Why did your doctor cut you off? Maybe you can find a new doctor or appeal their decision to stop your meds?
Also you could try edible marijuana for your pain too. Since edibles pass directly through the stomach and liver they are metabolized in a different way then smoked weed.
You could also try kratom, it's the leaf of a tree that grows mostly in Thailand, Malaysia, and such countries. It works on the opiate receptors and for some people it works fantastic for their pain.
It is slightly less addictive than regular opiates but does still carry significant addiction risks. The plant is very safe with the exception of a select few in the population that get liver problems from it, so if you decide to use kratom get regular check ups with your doctor. I'm not sure of the legality of kratom in the UK so you may want to check that out before ordering some.