It is so difficult when you lose someone close to you - a relationship with a brother is unique. My older brother and I are 18 months apart and we grew up playing sports together every day.
Lost him 30+ years ago at the age of 24. Think about him every day.
Sorry to hear of your loss and the pain it has brought into your life. Yet, positive to hear of your supportive relationship with your brother, the shared close experiences with BYU sports and other events - these will last you forever. I am sure that he was so blessed by his relationship with you as his brother.
There are some good grief resources out there - drop me a note if you want some references.