In addition to meditation and relaxation exercises, I'd like to point out the fact that the experts in this field are not rushing to operate until it reaches 6/6.5 to me indicates you are still not at risk. Also, being a patient in a hospital undergoing open heart surgery when the hospital is inundated with coronavirus patients, for which there is no cure presently, sounds like you are not only being protected from a horrific disease, but also have a good amount of time before your operation might be necessary. Personally, the last place I'd want to be now would be a hospital!