Grieve like you would any family member cause horses are family! It’s ok to take time to mourn them. If they were in pain at least they’re not suffering any more! I planted a tree for my old horse and now I see it every time I drive into my house!
Cry your heart out, try to think positive and never forget the really good times you had with your horse! I hade to put my horse to sleep some years ago and it was the most painful think I had to do! Try to keep your head busy, it helps!
I’m probably not the best person to answer this question. But When I had to put my horse to sleep (she had EPM) I went through a really horrible depression. All I wanted to do was lay in my bed and be invisible but I just got up and took a shower and the next I did a lil bit more and a little bit more. And I just kinda moved on.