So sorry you are dealing with this pain! I lost my Jack Russell of 14 years last year and having him humanely put down was the hardest thing I have ever done. He had auto-immune disease of the nervous system and it finally attacked his liver. I had him cremated at a pet crematorium and he’s in a small maple box on my dresser. I miss him every single day.
It will take a while but it will get better. The breeder of Kipper stopped breeding JRT’s and started breeding Feists so after the heart crushing pain numbed some we got three of them (siblings) and love them dearly. I started looking for a rescue but couldn’t find any small dogs or we might have adopted. Adopting is always good.
I hope you heal and eventually are willing to give your heart to another deserving dog. It does help.
I am so thankful to you and everyone who's posting on this thread and sharing. I'm comforted by it knowing you all are here. Thank you so very much!