I was diagnosed with B12 def at ER at levels that are undetectable. Was given a shot every month for 4 months and my levels after 4 months were at 380. Based on these levels the doctor said i don't have absorption issues but after some hot discussion they sent me for IF ,Celiac ,MMA test and all came negative and they put me on a weekly shot for a month and stopped for two months and told me to take supplements. My fatigue,brain fog, headaches,ringing in ears , tingling and pins and needles situation got better but have some dizzy spells , muscle wasting, muscle weakness and anxiety. i changed my doctor and now they have restarted weekly injections for another month and monthly shots there after. All these doctors says i don't have absorption issues and it is caused by diet as i was vegan for most of my life and the nitrous oxide exposure . I believe my treatment regimen is wrong so far and i want some expert inputs on my absorption issues and treatment .