I have had my b12 deficiency for over 10 years. I have become more tired and constantly feel exhausted. I do have my injection every 12 weeks. I have told my doctors but being a mum of two the just say yes down to that as levels are normal. Even if I do get good night I just feel very tired struggle to get out of bed by lunchtime I'm knackered. This is making me very grumpy and short tempted. Does anyone else feel like this or can it be something else.