I have kept on at my Doctors, downloaded documents and circled what I wanted them to take note of. Symptoms that we all suffer with and at the end have told them that 12 weeks interval between jabs is not enough B12 to keep the symptoms at bay. I found that printing off pages from the NICE website helped. I have kept on at them and told them I am self-injecting and I have improved my health by doing it my way. They have finally agreed to let me have them 8 weekly and if that is not enough I can go to 6 weekly. So be a nuisance, print off documents to help your case and do not give up. If we give up no one will ever listen to us or understand what we or the next person are going through. Good luck to all.