My wife suddenly started getting very bad headaches but only while she was at work. After a few weeks she accidently discovered the cause.
I had bought her an amethyst necklace while on holiday in France. She subsequently started wearing it every day for work and that's when, we realised afterwards, she had started getting the headaches. One day, though, she forgot to put it on and that day she didn't get a headache, which is when we made the connection!
So she stopped wearing it altogether and the headaches stopped. Weird, don't you think?