Low potassium at 36 weeks

Has anyone else experienced low potassium during pregnancy and what was were symptoms?

Backstory: a week ago I was experiencing a lot of heart palpitations and feeling weak and tired. I thought it was just part of pregnancy, but the palpitations were scarring me. I finally called my doctor and she did an EKG and bloodwork Friday. I had to wait the whole weekend for the results. Monday she called and told me to go straight to Labor and delivery for transfusion of potassium. She told me it would only take a few hours and I would be back home. They gave me 4 bags of potassium and did bloodwork and it came back even lower than Friday. Ended up staying overnight. 12 bags of potassium and 2 bags of magnesium later, I was able to go home. I am now on a potassium supplement and will get more bloodwork on Monday. Baby is fine and she is healthy and measuring on time. But, I feel like junk. I feel so out of breath. Have palpitations every now and then. And when I lay down, it’s like I have a weight on my chest. I am also anemic on top. I feel like this baby is draining the life out of me. 😓I don’t know when I should be concerned about I feel breathing or still have palpitations. My EKG showed signs of irregular rhythm. I’m lost what to think. I just want to have a healthy baby and be over pregnancy. 😓