The problem is that some of the stuff works but most of it is quackery. I just had a look, and there do seem to be some placebo-controlled trials showing ginger

The problem is that some of the stuff works but most of it is quackery. I just had a look, and there do seem to be some placebo-controlled trials showing ginger is effective at reducing vomiting in pregnancy. For acupuncture there are studies showing it is more effective than a placebo, although it doesn't seem to matter where you put the needles...basically it looks like poking yourself with needles reduces pain, but all the so-called acupuncture points are probably just quackery.