Psychic Shield

Remember that pain, exhaustion, hunger, thirst, negative emotions, and drugs (prescribed included) can weaken your energy field.
A psychic shield will only help temporarily if you are suffering from any of these, so take care of your physical and emotional needs as soon as possible.

Meanwhile, you can protect yourself from negative or distracting energies by physically reinforcing your overall energy field.

Inhaling deeply, draw energy down from the sky and up from the earth simultaneously. Allow the energies to meet at your solar plexus (right under your ribcage), and then flow out to your energy field. Visualize the field as a glowing layer all around your body; as new energy enters it from within you, see it strengthening and expanding. If it initially feels as though it is only a thin layer over your skin, see it thickening and moving outward as it grows stronger and brighter.

Now visualize the surface of your energy field becoming a silvery mirror that reflects anything you would not wish to enter your space. However, know that it is a semi-permeable membrane; light, love, and any positive energy can pass easily through it, into your body.

If you wish, you may also call upon your special deity, animal ally, guardian angel, or spirit guide to lend their protection and remind you when your energy field needs another boost.