Man so sorry to hear that. But I think we've all been there, it happens and is part of hunting. Sometimes you don't make the best shots. I lost a deer earlier this year already. Thought I hit it great, just a little further back than what I wanted but still a good hit. Searched for quite a while, got into the worst swamp I've ever been in, with 5 people we were almost literally crawling through because it was so thick and lost the blood trail.
Went down to a tiny drop here and there then nothing. Made me sick.