So, you need to start off by reciting Surah Ikhlas and Durood-E-Ibrahim as frequently as you can just after each compulsory prayer (Namaz). Then it will help should you recurring "Wala Houla Wala Quwata, Ila Billa Hil Aliyul Azeem" at least 1000 instances each day. Remember to do Astagfar for all of the terrible sins you probably did previously.