Could i still have a B12 deficiency?

Hello,

I have suffered for a few years with a sore tongue and mouth, severe tiredness, forgetfulness, depression, weakness, headaches and more recently migraines and blurred vision.

When i had my third child 2 yrs ago, they tested my b12 and it was low so i had a course of injections. Ever since then , the symptoms haven't gone away but blood tests always show up no signs of a deficiency, although once it did show low folate levels and i took a supplement for a while.

I was a vegetarian from the age of 14 to 23 and didn't supplement my diet at all. Now,i have weakness in my limbs, i find it hard to wake up in the morning, i find it hard to grip things, my memory is not good and i have palpitations all the time. When i had bad migraines recently my gp put me on amitryptilline which was good but made me feel even more tired, before that all my symptoms have been put down to depression.

I am now on nothing, no antidepressants, and i feel the worse ive ever felt, do you think i have a B12 deficiency but it is not showing in the tests and what should i do?

Thank you,

Laura