The multiple divorces pronounced at one time (or concurrently) considered as one divorce, according to the preferred of some eminent scholars.
It was the verdict of the Prophet (peace be upon him) as authentically reported in the traditions. However, it was Caliph Umar who ruled it as triple divorce; he did so to teach a lesson that people should not treat divorce lightly.
Umar’s ruling became the standard view among most of the scholars, including the four schools.
However, some of the eminent scholars such as Ibn Taymiyyah, Ibn al-Qayyim, and others have questioned the above ruling and advocated the initial verdict of the Prophet (peace be upon him). It has been preferred by many scholars today; some Muslim countries have adopted this view in reforming their family laws. They did so to avert chaos and family breakdown since people would often resort to divorce to vent anger or impulsively without prior deliberation.
Having said this, I should also point out: At the heart of the issue between you and your wife is anger management. I urge you to seek professional counseling and take a course in anger management, if necessary. Otherwise, I am afraid you may use divorce as a tool of intimidation every time you lose your temper.
For details, please refer to the answer linked below
Ruling on Triple Divorce
As for ruling on divorce in anger, you may access the answer posted here:
Pronouncing Divorce in the State of Anger
I would urge you to get counseling on anger management and reconcile with your wife: You may do this by writing down that you wish to take back your wife and get it witnessed by two people and sending it to her. Alternatively, you can also communicate this to her directly.
I pray to Allah to save us all from the evil inclinations inherent in our souls and help us remain steadfast on the path of rectitude.