Shots vs. pills

Why do some doctors prescribe monthly B-12 injections while others prescribe taking it orally? I would much rather take a pill than get the shots which require a doctor's visit each month. Also, I heard that the injections have been known to increase symptoms for those with panic/anxiety disorder. Does anyone know about this? How do you know how much B-12 is too much or too little---someone mentioned on this site that they have their levels checked---I don't ever recall having this done---can you request to have your doctor run this test for you? One more question---has anyone experienced fatigue or lack of energy a week to 2 weeks prior to getting your next injection? Thanks for any advice or info in advance!!! Take Care All :) Andrea

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