Gabapentin is also used to treat peripheral neuropathy. I have peripheral neuropathy from chemo and it does seem to have improved since my doctor increased my dosage. Again, talk to your doctor.
I have 2 nieces (1 on a pump) and 2 nephews (1 considering a pump) and a grandnephew (1 year old and on a pump) who are type 1 diabetics. I am type 2 diabetic and its been 22 months since I had cancer surgery. I do understand your problems, if your doctor can't help get another deoctor.