I have recently been diagnosed with deficient b12 and ferritin following a blood test, and the GP has put me on oral iron and b12 injections. I have had six injections over a two week period, the last one was on Wednesday. I felt great whilst having them, stronger than I have for months and it was so good to be able to do things and enjoy doing them, but now the fatigue is returning and I am having quite frequent spells of dizziness, especially when getting up from sitting. I am gutted about this, I thought I was 'cured'. The next injection is on 1 November. Do I need to take an oral supplement too?