I've heard about low iron levels directly affecting B12, can anyone shed any light on this? I was diagnosed Coeliac five years ago and PA two years ago. Since April this year I have also had iron deficieny anaemia due to heavy menstrual periods. I have hydroxocobalamin 1mg/1ml injections every three months and am due my next one in two weeks. The past month I have been experiencing dizziness, a feeling of ear pressure and tingling/numbness in my nose and cheeks which my GP suspects is sinus congestion, but I'm not sure. Could these symptoms be due to the B12 becoming lower than normal alot quicker due to the iron deficiency? Are they typical of needing the B12 shot sooner?