Can someone advise best natural remedy for high blood pressure?

My mom has essential high blood pressure sometimes reaching over the 200/160 mark. As her blood pressure has been high for a while she has an enlarged right ventricle which will and is leading to CHF. Her breathing is already heavy. Her doctor has given her Betaloc, Plendil, Inhibace, Dosan, Cartia a blood thinner, Lipex for high cholesterol and Quinine for night cramps. She’s in her early 70’s and she complains of head aches, extreme fatigue and loss of energy. She has increasing dark circles around her eyes as if she hasn’t slept in months with shortness of breath like she’s gasping for air. I would like her to try natural remedies because these synthetic drugs don’t appear to be doing much for her overall health. Can anyone advise some really good and effective natural remedies to treat both high blood pressure and CHF? I know Celery is good for lowering blood pressure.