whatever relaxes the body will also relax the mind
jacuzzis, spa baths, hot tubs or even a long soak in a hot bath will relax you
massage for relaxation is very helpful, how to massage books are available, electric massage machines sometimes help
try to get your partner to massage you
I was massaged for stress reduction for several years and it helped a lot, my muscles were very tense when I started but gradually softened, a trained masseur can feel the muscles that need working on