I am also an artist and musician who suffers from high blood pressure! I don’t know your whole medical history so I can only tell you what works best for me.
The biggest two things I’ve done to keep it under control are quit drinking and change my diet. It’s helped me lose a lot of weight and lowered my blood pressure significantly! I’ve always played my guitar when I’m feeling stressed and that helps a lot but lately I’ve also taken up cross stitch which has been IMMENSELY helpful to me! It’s relaxing but it also requires quite a bit of focus so I can get out of my own head and calm down. The other thing I do that’s even more helpful is just going out walking! I started out just walking around the block but now I go 4 or 5 miles with no trouble lol!
I do take a very low dose of blood pressure medication, but my doctor has told me if I lose about 15 more pounds I won’t have to keep taking it anymore!