Ive recently been having neurological symptoms (numb cold feet) and have started researching b12 deficiency and realized I have a lot of the symptoms. I've had IBS symptoms for a year, fatigued, mouth sores,and weak muscles. But I am only 25 and not a vegetarian or vegan. But for the last two years I have been on rantidine (which is linked to low levels) and in those years I have breastfed my first daughter and was pregnant and breastfed my second daughter. My GP gave me a blood test and said my levels were fine. So what I'm asking is does it seem possible in b12 deficient?