Dennis, you're 82 and have just started to have high blood pressure ? !
To have reached that age keeping it under control and keeping a first class medical is impressive by any standard.
I was put on blood pressure medication at 37, fifteen years ago, nothing 'natural' worked but the medication was very effective.
Like you I avoided taking 'pills' of any kind having grown up exposed to some Victorian attitudes towards them. As a result of my reluctance to take them my untreated high blood pressure gave me a permanent heart condition.
Its not that serious (as long as it doesn't get worse) and I kept my medical but in retrospect taking a pill every day is well worth it to stay healthy.
Definitely avoid caffeine and salt !