Im 21, 5'4", 120 lbs. i've been having heart related symptoms for 2 years w/out diagnosis. hr goes to 175 bpm after a 15 mn shower. what should it be?

Tachycardia : The heart rate can change depending on activity. It can also be abnormal from a problem in the heart or outside the heart. For example, someone is dehydrated in the morning and takes a shower, that dehydration can cause the heart to beat faster in reaction to the loss of fluids. Patients drinking coffee or an energy drink can have a raised heart rate. See your doctor.