I have been having all day tachycardia that’s gets worse upon standing. Stairs are very hard for me as I get short of breathe. I get tired doing basic chores. It’s always pounding all day long. Doctors don’t know what’s going on they just say it looks normal rhythm and seems like it could be my body’s response to pregnancy which makes no sense i have had 5 other pregnancy, 2 loss , and never felt this way. I also have what’s called Addisons Disease which is an auto immune disease. But my ending says it’s not related. I’m so confused and upset that nothings being done. Has anyone else felt this way before? I’m currently 14 weeks and 4 days.