Vitamin B12 shots

Anyone still get these? I used to get them years ago and lately I've been considering having one. I've been run down feeling the last two weeks. Years ago, I was severely anemic. Go figure, I always thought anemic people were skinny but no such luck in that department. Anyway, I called our doctor and he does it. I just have to get the energy to go down there. I had to reschedule my gym update appointment because I just feel bad. I was wondering if anyone still gets these and if they work. I know they do on some people really well. Back when I saw the allergist they swore by them and always gave me one when I'd come in for my allergy injections. I think it's time to try one again.