While traveling this week, I wound up being admitted to the ER with extremely rapid heartbeat, BP of 185/90, and rapid pulse. Had the chills and severe weakness as well. The only lab work they did was electrolytes and thyroid. I did need an increase in thyroid med but no lab was done for iron or blood count. I was told by my thyroid forum it sounded like I had low iron. So, I had a local doc do labs for iron and blood count. Blood count was okay. Iron was very low normal. My levels were taken in July as well and they had fallen quite a bit since then. Doctor emails to tell me my iron levels are fine and to follow up with my thyroid doc. I don't know why I'm surprised. I feel terrible. I did start taking iron supplements a couple of days ago. I know it takes time for them to work. All my symptoms point to B12 anemia (pernicious). First, will iron supplementation help B12 anemia at all? Also, when I try to take even a small amount of hydroxy B12, my heart starts beating rapidly. It's tough since my heart rate is already elevated because of low iron. I've been taking B1, B2, and Biotin with it to help calm reaction but not helping. Can Niacin be taken with hydroxy B12? Will this help calm the heartbeat? Please help. I feel terrible and the dr's are clueless.