I am new here. I have pernicious anaemia and have been receiving B12 injections for 5 years, now at 10 week intervals. For over a year I have been experiencing "episodes" where I get palpitations followed by passing copious amounts of water during the night. On getting up in the morning my blood pressure starts to drop, I feel very weak, especially my arms and shoulders, and dizzy. Since May I have been taking my own blood pressure as soon as I get downstairs, before eating, drinking, washing or dressing. Sometimes my BP goes on dropping for up to an hour. I have had many tests for heart, lung and stroke but all negative. My GP thought it was anaemia of imflammatory response due to past gastric troubles but got no further. My theory is that due to iron deficiency my body acts as its own diuretic, reduces volume of blood to concentrate the iron which then leads to low BP. Has anyone else experienced this?