so upset, doc won't help me :-(

So Iv had thyroid problems for a while now but recently found out I have hashimotos, basically my immune system is attacking my thyroid. Doctor won't do anything about it though until it's totally destroyed it and I'm very unwell. I'm also b12 deficient but because my levels are "in range" they say they are normal. Although they are borderline low and every bit of research I have done says my levels are really low and I have all the bad symptoms! I didn't get any help whatsoever! I'm also pregnant and I just feel like crap! The doctor didn't listen to any of my symptoms and he didn't know the answers to any of my questions!!