It is indeed very sad to hear that your late son took his life. May Allah ta'ala grant him ease in the Next life. Most important for you is not to ponder on why and how, but more on what you are able to do to contribute to helping others around you to avoid repetition of such an incident.
You experienced this, so you are able to help those around you and the community to bring about awareness. Take this unfortunate incident and use it for positive use. This will not only keep you occupied from having negative thoughts, or, God forbid, falling into depression, or losing hope in your life as well.
You should try to do righteous deeds and grant its reward to your late son. Do charity work on his behalf, and try to let others remember the good things about him, so they can be insired and learn from all of this.
Another thing that would be important to do is reach out to a qualified counselor who can give you professional tips to deal with such loss and overcome this difficulty.
With prayers for your success.