Binaural Theta waves through headphones or Monoaural Theta/ isochronic theta without headphones. Couple this with deliberately slow and deep breathe. In through the nose and out through the mouth. Breath deeper than you every have before and imagine yourself being at peace and one with Love and Light. You'll be amazed what happens. The different forms of theta waves can be found on youtube or through various apps by searching the terms. Delta work too but I prefer theta. If you don't have access to the waves just do the breathing and it'll still work. Remember that you are the master of your thoughts… When you remember how to be.