At the time you feel anger within, recite:

أَعُوذُ بِاللَّهِ مِنَ الشَّيْطَانِ الرَّجِيمِ

Roman: ‘A’oothu billaahi minash-Shaytaanir-rajeem

Translation: I seek refuge in Allah from Satan the outcast.

Reference: Al-Bukhari 7/99, Muslim 4/2015.
Reference: Qur’an Aal-‘Imran 3: 190-200; Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 8/237; Muslim 1/530.