Anyone know an easy and effective relaxation exercise?

Unfortunately I find myself experiencing a variety of menopausal symptoms…giving my age away here! :)
Anyway, even though I know many of these symptoms can be associated with menopause, they can also be signs of more serious illnesses, such as heart attack, cancer., etc. which of course makes me anxious. I think I’m caught in a vicious cirlcle, so I’d really like to calm my thoughts and see if some of the symptoms disappear.