I assume that you are under a physician’s care.
Things usually recommended are trying to lose weight if applicable and engaging in regular aerobic activity. There are also dietary recommendation called the DASH diet, and here is a link with more information http://www.nhlbi.nih.gov/health/public/heart/hbp/dash/new_dash.pdf. This information is issued by the US Department of Health and Human Services.
I wish you good health.
I’m not a doctor so this isn’t professional advice.
High blood pressure can be caused by too much viscosity of the blood or too much constriction of the vessels. (and a bunch of other things so this is very generally speaking) Vasodialation can ease constriction while allowing overly viscous blood to impact the heart quite negatively (i.e. clots); while decreasing sodium can decrease viscosity but may also speed up blood flow causing the pressure to raise. Without a proper diagnosis from a trained doctor, most here will not be able to offer much advice within their scope of practice more than what a typical Google search can provide.
Some helpful Google sites I have found: