My blood pressure is very high and i have a achy pain in left arm should i be concerned?

Absolutely: High blood pressure is a risk of heart attacks . If you are having pain in left arm do not ignore , get checked as soon as possible.

Yes, Be Concerned!: Untreated high blood pressure is also called the "silent killer' because it causes damage to the heart, kidneys & brain. Any unexplained left (or right) arm / shoulder / neck / jaw / chest discomfort should be evaluated asap, especially if heart & stroke risk factors such as high blood pressure are present. See a doctor asap (now).