<s>[INST] Hi my resting pulse rate is at 102 bpm...it has been like this for 2hours, im experiencing an uncomfortable uneasiness in the left side of my chest...i am also experience lower backpain that moves to both sides of my waist, i have a fever, and also have a headache all day [/INST] Hello! Thank you for asking on Chat Doctor! Regarding your concern, I would explain that tachycardia is usual during an infection and the fact that you have fever indicates that you may have an infection. I recommend consulting with your doctor for a careful physical exam and some tests: - a resting ECG-chest X-ray study for possible pneumonia-abdominal ultrasound-lab blood tests (complete blood count, kidney and liver function tests, PCR, sedimentation rate). You should discuss with your doctor on the above issues. Hope you will find this answer helpful! Best wishes,  </s>