I'm a 19 year old female. I am experiencing a high resting heart rate from past few weeks. Sometimes it's so high I can hear it through my throat till my right ear. Dizzines and palpitations in chest. Pain in feet and shoulders. It rapidly increases after having a meal or doing some work. My bp & thyroid profile are normal. I have a low immune system since I suffered from swine flu back in 2015. I even have beta thalassemia trait.