I have been having chest pains on and off for the last 24 hours. I have also experienced tachycardia within the last 24 hours. My heart rate is normally on the higher side but even just resting today it was reaching 120. My blood pressure usually runs around 110/70. Today my blood pressure has been about 122/89. I have been reating all day as I have been very tired and have had a constant headache. I just checked my blood pressure and it is 96/63. Should I be concerned? Should I go to the emergency room?