Yanno, regardless of what the physicists might say, if wearing a magnet helps you to feel better, it's all good. The mind is a powerful thing.
I happen to know first hand that magnotherapy changes one's humour. It makes people happy. Case in point is, my dad had a steel plate in his skull ( a WW2 thing) and everytime he came downstairs fer breakfast, he'd walk into the kitchen, a dozen fridge magnets would fly off the fridge and hit him in the forehead. That would make everybody's day. It became the family's morning chuckle.
Now of course, manufacturers have taken that bit of joy from our lives by flooding the market with stainless steel.