My advice is to ask to be referred to a cardiologist. They have a lot more tricks up their sleeve and have treated hypertension for a living. Once they establish a medication regime for you, maintenance can be done by pcp. There is such a bewildering variety of bp meds – I am sure your cocktail is somewhere out there too. Speaking from the experience of relatives. Just out of curiosity – you mentioned you had a very mild case of covid – but you are on oxygen? Did they scan your lungs when you were sick? It's worth knowing if there is any damage there as pulmonary rehab can do wonders for overall health too!