I had the same some years ago. Was first in to the house to find someone I adored was no more.
To be entirely honest with you, I don’t think you ever fully get over it. You will, however, learn to cope with it. Focus on why you were close to them, focus on the positive they brought to you in your life, and the positive you gave to them. In my case, I found that it helped to think that she would have been glad it was me who found her. I truly think she would have, too. My daughter has her name as one of hers. Her memory goes on.
Talking is important, talk to people you know, and who care, and especially with people who cared for the person you found as well. No need for any gruesome details, but I found that her friends and relatives were glad to know that someone found her, that the process could be finished (If that’s not too cold and calculating).
Now, getting the good job news can, and should, help the recovery I hope. Try and think of it as a quid pro quo. There’s some bad shit, but then there’s some good shit.
Above all, though, I think the key is to learn to deal with it. You may never get over it fully, but you can deal with it.