Snakes, I'm so sorry for your loss. Take all the time you need to greive. The only thing in life that seems to be true is impermanence. One day you will have fond memories of your brother, smile and celebrate his life. If your relationship was difficult, you can find forgiveness.
In any event, sudden deaths of any kind are difficult. We don't always get the chance to say the things we would have liked to say. Sometimes the JW factor gets in the way of greiving, for example, when we are excluded from the funeral services. In that that case, you will find your own way to move forward. Trust the process. Learn kindness and forgiveness toward yourself and others. We all have our own struggle. Some of us have been where you are now, and we care.