I would also say anything that reduces stress helps - stroking a cat, reading, listening or watching something pleasant (but not music with 'moods' in the title, the very thought just raises my BP

).
When I was in my 20s I did Transcendental Meditation for a while. Not the advanced courses and the flying nonsense, that was just a money-grabbing scam as far as I was concerned, but the basic relaxation technique worked (and still does if I care to).
We're going on holiday in a couple of weeks, that will be interesting to see what happens to my BGs.