Hi I had my loading doses which finished in April . Next regime was 3 monthly . I felt the best I have in years as my b12 went from 250 to 2000 . My bloods were checked in June and they had dropped to 1000 again so my questions are .does that mean that the injections were working and is it normal for levels to drop after a couple of months . Also when I got my much awaited injection on Friday I have not felt as good as I did . Could it have been given wrong . I have low mood weakness and tingling all back again . What else should I take .? My folate levels seemed fine but I am wiling to take whatever I need to feel good again .