I had appallingly high blood pressure (999 instructed me to get to hospital high on Boxing Day just gone - my reading was 199/137) but now my readings are normal for healthy people. Granted I still take the meds but they are gradually being reduced and this time next year I should be drug free.
Can I suggest a couple of books?
One is 30 days to natural blood pressure control by a couple of medical doctors.
The other is Fix your High Blood pressure in 90 days or less. This is also by a medical doctor - Dr Joseph Amagada FRCOG, MBSLM. He also runs a Youtube channel, zoom meetings and a forum.
I use both books in tandem. They both say to exercise every single day. About 30 minutes is fine - I use an exercise bike but I don't have high resistance or anything. My GP is fine with it and asks only that I don't go mad with it.
Also, I am on a plant based diet which I know wouldn't suit everyone but it's important to eat the as much natural food as possible - veggies, salads etc - and as little ultra processed food as can be managed.
Reduce salt - this matters hugely - and also saturated fats (use olive oil and as little as possible). For butter try and use Benecol - it's great to help reduce cholesterol.
Sorry for the marathon read but this subject is dear to my heart (literally) because I'm fighting a battle to avoid stroke and heart attack. Your husband should be fighting the same battle.