Intermittent Blood pressure spikes and then BP goes normal

I am 73. Until6 months ago, I was in good health. Then I had a stroke. Since then I have suffered from intermittent spikes in Blood pressure as high as 260 over 165. Within hours it drops to normal and stays there for days. 2 Cardiologists and 2 Stroke specialists say they can find nothing wrong with me. But they all prescribed BP and Statins with Aspirin which drove my BP dangerously low. Noticed a sudden intolerance to rice, salt, pilsner beer, honey, sugar, Vitamin B, Coffee, Tea, fruit and berry juice. which all send my BP over 200/140. But I can eat berries and fruit. Can drink Guiness and red wine. Have had second stroke but7 specialist have told me I am in perfect health no liver, or kidney or heart or lung problems. However I am an empath and my wife has diabetes and I get many of her symptoms, but I do not have diabetes. I used o be able to touch people and heal them until I got Cancer and was given chemo and radiation. 10 years ago. Had to stop. Checked for plaque in arteries. No problem. No hardening of arteries, blood good. Catscans, MRI, chest and neck X ray all clear. No expert knows what is causing these huge spikes that are not stress or exercise related. Any ideas.