1.Stop eating excess salt...infact try and restrict your salt intake as muc as possible. Also, therefore, try and avoid foods that contain high amounts of salt like pickles, chips/wafers, bakery products, salted peanuts etc.
2.Stop eating fatty foods, especially those rich in saturated fats. Try and use minimal amounts of oil for cooking. As far as possible, use mono/polyunsaturated oils especially safflower/sunflower oil or groundnut/olive oil.
3.Eat a diet rich in cereals, protein and veggies and fruits.
4.Start exercising regularly. Just dieting alone is not enough. Regularity in exercise is important.
5.For every 1 Kg weight that you lose by dieting and exercising, your Blood Pressure will decrease by around 1 mm of Hg.
6.Introduce lifestyle modifications, like avoiding stress
and try meditation
for relaxing and for relieving stress...it will definitely help in lowering ur BP.