This is the mantra of Potuluri Veera Brahmendra Swamy. He is a great saint from Andhra Pradesh who wrote Kalagyanam. Chant this mantra for peace, health and happiness.
Om Hreem Kleem Shreem Shivaya Shri Veera Brahmendra Swamine Namah.
Please make it a point that you do dhyanam of your Ishta Daivam atleast 5 min daily if you can do more better if you can do more then chant the name of god whenever you get free time in a day. But have complete faith in your Ishta Daivam. As prayer offered without faith does not yield any result.