Are Vitamin B Injections Helpful In Treating Anaemia?

Good Day, Doctors! I have just been diagnosed with "Pernicious Anaemia" and I have been prescribed injections of Vitamin B, the first of which I have just had. However, despite the diagnosis, I feel terrific. I am 71 years of age tomorrow, and whereas I used to get very tired and sleepy during the day (for a few years latterly) I am now feeling terrific (Thank God) (and my Doctor!!) and do not feel tired, working at least five days a week and loving it, non-manual. My only previous medical points of interest are: one stent, four years ago, recurring UTI (4 x times over a period of 8 months, and then a hernia operation. My UTI, incidentally, has not recurred since my hernia op 3 months ago and the "flow" of urine etc., is perfect - as good as ever and much, much, better that prior to the UTI problem. My apologies from "rambling on" (Irish affliction!!!) - my question is - do you consider that, despite the fact that I feel terrific at present, the Vitamin B injections are the way to go for my anaemia. One last thing, I sleep very very soundly, but I waken as though I had been knocked out! Is that good or bad? Thank you, renewed apologies for verbosity! Your service is great, thank you. Éamonn.