First, as a newly (self-diagnosed) B-12 deficient, I'm so grateful to have discovered this site! For some background, a year and a half ago my blood tests showed signs of macrocytic anemia (high MCV, high MCH, high lactate dehydrogenase). My doctor dismissed it as "probably nothing" and ordered no follow-up testing. After my exhaustion escalated to unbearable levels, I finally ordered my own labs to discover low B12 (folate was fine). Several weeks of sublingual B12 did nothing, so I got my first B12 injection 4 days ago. I've been feeling quite good these past few days, but I'm not sure how long to expect this to last. Since I'm now directing my own treatment (I don't trust my doctor any more), I'm wondering if you all could advise on how frequently I should be getting injections. I see recommendations ranging from every other day to every 3 months, so I'm somewhat confused. Do I wait until I start to feel tired again, or is it important to keep them up more frequently, before symptoms return?