Hi I'm going through a bit of stress at the min relationship wise but have noticed I'm v tired this week and been getting a funny heart feeling also . Bit anxious and feeling down . I'm on 100 mcg due blood tests next week doc suggested alternate days with 75mcg but when iv reduced in the past I get weakness and joint pain . Iv hashimotos haemachromatosis b12 deficiency peri menopausal . I'm due next b12 inj in July . I don't know how to treat this as the fluttering is new and tiredness is exhausting . If I thot it was low iron I would treat but I'm scared due to haemachromatosis .