There's been some awesome answers here, please seek out and be a part of a community when you're ready, for those that share your experience.
Here's an online one:
Suicide Bereavement
As someone obviously suicidal, a son, believe me you did nothing wrong that any good parent woud have done in your shoes, there is no perfect parent; his illness took him to a better place, and he is and will be proud of you for keeping on for his siblings, and yourself. I can say that as I'm proud of you! Cry, scream, do whatever you have to do, in the days, weeks, months, years, this imperfect world is not your fault. You were the best person for him during his time here. I'm sorry it was cut short.