So, pending the results of several blood tests, I will begin receiving B12 injections.

B12 is only absorbed in the ilium, the very last part of your small intestine. Mine hasn't been working properly for several years now, so it's a good thing your body stores LOTS of B12 - enough to last you a year or so with little deficiency. Unfortunately, due to my poor absorption in the past and the complete lack of ilium now, my reserves have reached their end. Symptoms of B12 deficiency include poor memory (James will vouch for this one), chronic fatigue, muscle fatigue, sleepiness, and stress. Oh, and some pretty bad neurological disorders that I won't mention. Fortunately, personal anecdotes and online research have shown that even a day after the first injection, my stress will decrease, I'll have SO much energy, and my memory will start coming back. Woot!