Writing a list of your top seven qualities and carrying them around with you is a good way to remind yourself who you are and what makes you unique and special. This is turn will help you to appreciate yourself.
Take time to think about times when you have made a success out of something. Spend time writing these acheivments down in a list and refresh your memory about how you did this and how it felt to achieve certain goals.
Pick up words and body language that they use and add them to your own repertoire.
Use constructive questioning on yourself to ensure the irrational voice gets less airtime than the rational voice. Keep practicing this, as it will give you an overwhelming sense of control over your negative inner voice, which is invaluable in many situations in life.
Eat well and try not to drink too much alcohol. Going to sleep early and exercising will all indicate to yourself that your worthy of being cared for.