Had my loading dose in July and over the last couple of weeks a lot of my symptoms have come back with a vengeance. Have just been back to the Dr. who announced that if thats the case it can't be B12 deficiency as I should have enough B12 to keep me going for three months. He also said that my B12 isn't really that low and was surprised I'd been given a loading dose. He has agreed to me having another blood test next week. I got a copy of my results from my initial blood test. My B12 levels were 179 ng/L and my serum folate 7.5 ug/L. Not sure what these mean, not sure what else I should do. I would appreciate any advice please.