Put the tongue on the roof of the mouth and move your awareness from your head down through your tongue and on down the front centre line about an inch inside the body. Someone jacked up on some of these breathing practices might also have over-stimulated their adrenals, so it's also important to concentrate on relaxing. Once you can go right down the front line, loop back under the trunk of your body and go up the spine. Just keep moving your awareness around this loop while relaxing, making sure to finish at the belly.
Failing that, try walking barefoot while allowing yourself to relax more and more. It should have a similar effect.