Thanks Katherine! Still processing, to be honest. I am very very upset, and scared to google. Doing a bit of a brain dump.
The good news:
Fortune's WBC is good, and improved since chemo
He is much calmer when handled now, and the onc teams loves him

I mean, who wouldn't?
He loves his carrier bed - he actually SAT IN IT when we got home (I put it by the heating vent, but still a W!)
He is not constipated! Scooped the litter box today, and wowza! lol
His weight is stable (still too skinny, but we'll take the W)
The not good news:
His creatinine is now 8; it was 4 when he was discharged
His potassium has dropped further since being discharged
His RBC is a bit lower, but we can continue chemo (if we choose), and we may need to administer darbepoetin if it drops
Next steps:
(the onc is terrific and walked over to the internist and made her look at the blood work. They agreed to the following)
Increase subQ to every day
Increase potassium to every day
Restarting the antibiotic he was on - he showed improvement on it - also in the hospital - so while it's a long shot, I wanted to try it to see if it helps.
I also forgot to ask what his phosphorous level WAS - in the hospital it went UP during his stay to 9.7

The internist, when asked on Tuesday about a binder, said he does not need one at this time. I forgot to ask the oncologist about it, and I keep forgetting to order it - so I made DH do it even though they didn't recommend. I don't think the internist is being proactive. She has repeatedly said that it is his CANCER is causing his nausea, however everything is pointing to his kidney

The onc explicitly said she believes it's what is causing everything.
On u/s a week ago, his left kidney showed only mild changes, so I'm at a loss as to why it is progressing so damn fast. And I forgot to ask her thoughts...
I'm so so upset. He IS eating, but only a little bit at a time, so I'm trying to remember to offer him food frequently. I'm working on a calorie counting sheet to pull in total calories by day so I have an idea if we are feeding him enough to gain.
If he doesn't start to improve, I think we are going to have to say goodbye. And just writing that is KiLLiNG me.
But I cannot wait it out; right now he is doing well most of the day - he had a good breakfast, didn't pee in his carrier (the long trip + long wait in the hospital can be a lot and sometimes he cannot hold it), he had a nice snack when we got home, and he climbed up his cat tree and sunned for a while. We had lots of snuggles both pre-and post vet visit. He had food at +10 and PMPS (yay) and I'm going to offer him some more in a bit.
We increased the ondansetron again to 4mg 3x/day to hopefully help. I saw my new GP in the hallway and asked about cypro - she said it's more of an appetite stimulant vs nausea control. Fortune HAS an appetite, the nausea just stops him from eating more

My good boy loves his food. I also want to give him gabapentin to see if it helps a bit - my biggest fear is that he is in pain. I am praying like hell that the antibiotic + fluids help my poor bunny, but I don't know if we have a chance. I want to provide him with the best palliative care possible, and if I cannot do that...
I just don't understand WHY it's progressing SO DARN QUICKLY!
Oh, I dislike his internist immensely. We are on a waiting list for Oradell. They may be doing "everything reasonable," but they are uncollaborative and brusque. I don't have confidence in her decisions (sound familiar, lol), and while I love that the oncologist can quickly consult with them and push them, it shouldn't be that way. The onc is indirectly managing everything. I am hoping so hard that he remains stable til his next recheck appt on 3/11 - if we don't get into oradell sooner. Hopefully 3/11 is lucky all around - it's when we are getting our second dose!