Stay strong! You can go through that, just pray and start to move on even it's so difficult. We all have that kind of experience even not on death by someone but someone we use to loved and separated with them, no matter how difficult is that, we should accept that. I know how difficult is that because I already experienced that, we also lost one of our college friends before.
Im so sorry for your loss. Im doing ok , and I fully accept what has happened. Im very eager to turn this negative into a positive by being more aware of mental illness .