Approximately 3 years ago I was diagnosed as being B12 deficient, however, the cause is not known as I tested positive for the Intrinsic Factor AB. My doctor has prescribed shots for me every 2 weeks and this is not enough! I know my body well enough to know. At first this regimen was working, but now my symptoms are coming back (fatigue, brain fog, weight loss, imbalance, awkward gait). I've asked him to give me a loading dos (alternating 5000mcg and 3000mcg injections every other day for 1 to 2 weeks, and then tapering down to 1x per week or back to 2x month). I've done extensive research and have found out that hydroxy or preferrably methylcobalamin is most effective, so this is what I have requested. He thinks I'm self-diagnosing and is not willing to make this change in the type of B12 or in the loading dose. I AM NOT going to regress and go back to the way I was feeling. I am a very active person and I am a triathlete. Both my personal, professional and married life are being negatively affected. I am aware that you can order B12 injections (hydroxy and methyl) from Canada, New Zealand, and India; however, I am wary to circumvent the health system and possibly inject myself with heaven knows what! I've been e-mailing back and forth with the founder of the B12 Deficiency help group and he has directed me to keep working with my doctor, but that tests have shown (he lives in England) that a loading dose of Methylcobalomin and the continued use of methylcobalomin is more effective than cyanocobalomin. I'm frustrated and angry that my doctor is not listening to me, at the expense of my health and my well-being. Please advise. Thank you,