I am so sorry to hear of your brother’s death. It’s been a few months since someone very, very close to me died. About the same age as your brother. Other people’s happiness can indeed be frustrating. I even feel bad when I myself have a good day and find myself laughing. I don’t really have any words of advice, but I just want you to know I am sorry to hear about your brother and your sadness. I am going through the same thing. Every day is hard. Just have to take it day by day, sometimes minute by minute.