I'm not spiritual and haven't done much martial arts or meditation. Do you actually feel these feelings? Do you believe it's placebo, or some mind trick, or is your mind really manifesting these feelings in your body?

Also as you seem to take great care in your wellbeing I can't suggest looking into mushroom extract drinks enough, like mushroom coffee. Not that MudWtr crap but species of mushrooms (not the magic kind) like Chaga and Lion's Mane have a ton of health benefits and as far we no there's no adverse affect to most of these extracts. Chaga is crazy, natural anti-inflammatory, and anti-tumor. They also remove free radicals from your body