See only the "good" things... and by that I mean the memories, etc. Every time you feel that sad feelings, switch your thoughts to a good memory... keep doing this over and over.
Also, if you believe in the concept of heaven, see it this way... your brother, who sounds like he was very intellectual, and who you will be re-united with some day, now has access to every answer to every question he could have ever imagined.... and imagine how fulfilled would that have made him while he was here...
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