i am 32 years old.five foot 3 inches and my weight is 10 and a half stone.i was diagnosed with low b12 5 months ago.i had 6 injections done every other day.then after 3 months i had a blood test done again and my b12 was low again i had used up all 6 injections.i had another injection and was told to have 1 every 2 months.i feel tired all the time my eyes twitch.i have poor memory,concentration.and have got very clumsy.and i have now been told i have sciatica as i have hd back pain for last 3 months and pain in my right leg and pins an needles in my feet.my question is is this linked to b12 being low again?i have been to gp and been told im sressed.they havnt done my bloods again.but im very concerned at feeling this bad at 32 i feel more like 70.