What were your symptoms of low b12?

I had got a blood count test and my red blood cell’s and hemotricit level was low. I started taking iron my levels are on the low end of normal. I feel tired and week. Random tingling in the bottom of my feet. I also am having worse constipation then usual. I am also starting to loose my sense of taste and my tongue feels weird. Then I’m gaining weight out of nowhere. Despite barely eating. It’s like my stomach is getting huge. Then I have been having low blood pressure. Has anyone had the symptoms of low B12? If not what were your symptoms? Does anyone think this could be low B12?.