My sincere condolences. My sister died quite suddenly and unexpectedly ten years ago. Obviously the circumstances were different, but this was a huge loss to me, as your brother is to you, and I can relate to some extent, especially when you talk about a blur.
And do not worry about not being able to telephone friends. I could not do the same, but one friend telephoned the others to let them know. I do not know if anyone can do this for you, but I am sure that your friends would want to know in the coming days, so that they can be there for you and be supportive.
Take care. With the emotions, I was told by doctors that it is good to go with the flow. I was all over the place so just try and hang in there.
Take care