Postural changes generate changes in pulse and pressure in normal individuals; to compensate for the changes of gravity and pooling of blood in the lesgs when upright, the body has to increase pulse and peripheral resistance to maintain blood pressure.
You should continue your treatments for hypertension
as indicated by your doctor, as well as low salt diet of at least 2 grams a day and exercise
Hope that helps, wish you the best health, blessings
Dr Brenes-Salazar MD
Mayo Clinic Mn