Good news about your husband. I deal with my asthma with EOs and also avoiding that which aggravates it.
I got my BP normalized with herbs. I can suggest some soon. My numbers were 160-140/100, for quite some time. Now averages about 125/65 unless somethings’ going on. It took a few months, and taking thyroid supporting herbs helped too.
What these thyroid-supporting herbs you used?