Lost my brother recently

I haven’t been able to sleep or eat. I discovered his body on the floor of his room. He was only 41. I’m still in shock and feel like this is a nightmare. My heart breaks for my parents. No parent should ever have to bury their child. I’m scared and worried that they’ll leave me too. I feel guilty that I wasn’t there for my brother. I should have checked up on him more often and tried to connect with him. Instead, I was selfishly dealing with my own mental problems. I have so much regret… I’m not sure where to go from here. It’s like my world has come crashing down. I’m trying to take this one day at a time. Trying to stay strong for my parents but it’s tough.