My 14 year old daughter was feeling very bad a few days after Moderna vaccine very pale chest hurts took her to the doctor and as soon as I told her she just had the vaccine she immediately tested her heart. My daughter had an extremely high resting heart rate and had to be put on a heart monitor. Also she had very low iron which I was not that worried about at the time due to her heart issues. Was told is just heart palpitations and is just a coincidence. I put my daughter on iron and vitamin C tablets which she took everyday for three months plus I increased iron in her diet. She just had her iron levels re-checked and they are now even lower and requires a iron infusion. My daughter was fine before the vaccine. Not happy that we all just get told it's just a coincidence, I don't think it is.