For others reading this, some people, myself included are quite sensitive to more than tiny doses of B12. We become agitated and hyperactive. I hear that some people can become violent. It makes sense to me to try methyl B12 sublingual before getting an injection.
I'd certainly wait for the results of the cortisol test before messing with HC! There are precursors to cortisol that are OTC in some countries, especially pregnenolone. It probably won't replace HC for those who are quite sick but might allow a person to take smaller doses.