I tested positive last June for gastric parietal antibodies but I had been taking a cyancobalin multivitamin with vitb12. My gp said usually people who test positive for this have pernicious anaemia but My bloods showed high levels of vitb12 and folate so he said I wasn't anaemic. Anyway I started feeling worse in November with vertigo, headaches, pressure in head etc and have since gotten worse with extreme fatigue, nausea, loose bowels, depression, brain fog and I keep feeling like I can't breath properly. I have read if we aren't producing intrinsic factor our body cant use the vitb12. If we aren't producing this what's the best way to take b12, sublingual or injections? I tried to explain this to my gp but he said my red blood cells would be large and mine aren't. I have looked at the symptoms of vitb12 deficiency and I have them all but how do I get my gp to believe me if my bloods are showing high levels of vitb12? I have some jarrow vitb12 sublingual at 1000 mcg and some methylfolate would this be enough?