Finally managed to get a consultation with my regular GP, rather than a locum. She has agreed to increase my B12 injections to every 10 weeks instead of 12. Unfortunately the waiting list to see a neurologist in South Wales is currently 12 months, so for now she is not going down that route. I am now waiting for an appointment for nerve conduction tests for the problems developing in my fingers and existing problems in my toes. In the meantime she will go back over my notes, write up a summary and arrange an appointment with a medical registrar, as she thinks there may be other issues to investigate as well as B12, (she wouldn't elaborate on what, said best to consider other problems than just B12 deficiency) I have been on levothyroxine for over 15 years, and have a lot of joint problems, recently in my hips so she also wants a MRI scan of my spine. But GP's in my area have been stopped from ordering scans at the moment due to too many unnecessary ones been done on patient demand rather than clinical need. She will ask the registrar to consider doing this, and hopefully he can do a quicker referral to a neurologist if needed. Fingers crossed this won't take too long.
Thanks for all the advice I have been given in previous posts.