My resting hart rate is 150 what should i do. i fell fine this rapid hart rate started about 2 weeks ago before then my it was about 55 bpm. i was weak the first day it started i think i was dehydrated. i have no symptoms i fell fine my bp is 122/78 im 62

Tachycardia : Tachycardia (fast heart rate) can indicate many things, including: recent physical activity like exercise a large meal emotional issues (nervousness , anxiety, fear) fever changes in blood pressure(high or low) congestive heart failure (chf) history of heart attack asthma anemia hyperthyroidism panic attacks/disorder stimulants potassium deficiency vitamin b deficiency extreme dieting arrythmias-abnormal heart rhythm dehydration-as you stated as you see the list is very extensive and there are actually more causes. For this reason i recommend you see your docotr right away for an evaluation and treatment if deemed necessary. Good luck.

Needs treatement: The most likely cause of a sustained heart rate of 150 is atrial flutter. This not only poses a stroke risk, it can permanently damage your heart if left untreated (causing a "tachycardia mediated cardiomyopathy"). Please see your doctor next week, even though you feel okay.