Causes for high bp i am on atenolol 62.5 mg and i still have very high bp can certain medications give you high blood pressure? also i am young, fit

Hypertension: Most people who have hypertension or high blood pressure have no known cause aside from obesity & excess salt. Yes, some medications can raise blood pressure. But in young people & those who need 5 or more drugs, we worry about renal artery stenosis, Conn syndrome, pheochromocytoma etc. Check out http://www.mayoclinic.org/diseases-conditions/high-blood-pressure/basics/causes/con-20019580