Hi Graham
I'd agree, definately keep pestering your doctor until you get the answers you need, ask for a second opinion or a referral if you don't think you're getting what you need. It could indeed be diabetes caused and neuropathy, but equally it could be a number of different things.
For example, I went to the doctors about 6 months ago convinced I had neuropathy because of the strange sensations I was having in my feet, I was terrified. However all the tests they did on them showed no trouble at all. After a long chat with the nurse trying to work out what the problem could be I went to get fitted for new running shoes, since then I've had no issues. Now, obviously I'm not saying that it's the same issue for you, just that there could be a number of different causes and it's not always the obvious one. Of course if it is then it's a case of looking at the different options available once you know what you're dealing with.
Hope you start getting the answers you need from your GP.