Keep your head up
@max 330 megafartz ... Sometime this shit takes a long time to get over. And in the end, who says you have to truly get over it right now? It's human and a healthy part of the grieving process can include lingering sorrow. The tree planting to remember Garth is a nice touch.
We were in a similar situation with a magnificent tuxedo cat we adopted years ago that had a supposed documented clean bill of health from the adoption rescue. Well, she had congestive heart disease but by the time we found out a couple weeks after the adoption, we were already attached. Medical bills up the yin yang, regular draining of the fluid around her heart every month or two, it didn't matter. We tried our damndest to give her the best life possible which we did for the couple years we had her till she passed about 9 yrs ago. I don't think I'm fully "over it" yet either, and that's OK.
On a side note, we were made whole (for the most part) by the adoption agency from a $$ perspective due to their inaccurate bill of health, but in the aftermath of everything, it wasn't about the money.
Anyways, this isn't about my story but more about you giving yourself the proper runway to do your thing emotionally. All the best to you and Katie my brother.