I’m losing everyone I love 💔

Within the last two weeks, I lost my brother and both my parents. The day after my 18th birthday, my mom and my brother were killed by a drunk driver on their way home from school. My sister and I were both very sad and shocked by this sudden loss. Our dad was also very upset and he became withdrawn and depressed. I tried to talk to him and tell him that we were all struggling but my sister and I were still here for him. I guess he was just too upset and two days ago, I found him dead in the bathroom. He overdosed on sleeping pills. I feel like I didn’t do enough to help him. I wish I could bring him back. We need him so much and he’s gone. It’s so hard for me to even comprehend all this change and tragedies. I am trying to be strong for my sister, but I feel so helpless and empty without them. Anyway, I don’t know if this makes any sense but I’m just looking for some advice.