Well, I know of some remedies, but they're also anecdotal :)
All the good ones I know are essentially breathing exercises, where you have to pay close attention to your breathing for a while (i.e. take control of your diaphragm). Like the classic "drink a glass of water from the far side of the glass" is actually a breathing exercise, which works just as well if you just do the breathing without the glass of water.
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