Hi and welcome to our group here. Firstly, it's important to point out that both galliprant and gabapentin will both be having an adverse effect on kidney function. Sadly, these are difficult choices we have to make as owners, and by veterinarians too. Trying to deal with one health concern often means we give medications that will cause problems for another one, and that's the case here with these two medications. Vets can often find similar medications that will not affect the kidneys so badly, so it's certainly worth having a discussion with yours about this issue.
It strikes me there are some liver issues (according to the blood values), so I would start giving milk thistle daily as a supplement. This will help protect the liver here onwards.
The pancreatitis is a problem. You should try (at least as well as you can) to reduce fat in the diet, as this will just inflame it more. Hills kd is actually quite high in fat, so it may be worth doing half and half, that is, half normal amount of Hills kd mixed with something like sticky white rice to add some nutritional fiber and carbohydrates.
Creatinine is very high and that's a worry. SubQs are okay, but really only designed for maintenance whereas what your dog needs now is slightly more aggressive fluid therapy from IV fluids. Talk to your vet about this. There is also some anemia creeping in, which is probably non-regenerative. Once fluid therapy is finished, you should recheck the RBC count to see if the anemia is still evident. You might also ensure you give some iron supplementation, which may help (again please talk to your vet about this).
Hydration is the first priority, so you are right about that. Then making sure you are giving enough food to prevent malnutrition. It can help to divide the normal daily food into 4 smaller portions given at equal times throughout the day. These smaller portions help relieve stress on the kidneys and reduce nausea.
If inappetence continues to be a problem ... talk to your vet about Omeprazole - or Mirtazapine.
Let me know the weight of your dog, the amount of fluids currently being given daily, the type of fluids too.
Next, phosphorous is very high. I gather you aren't giving a phosphate binder with food? What you really need is aluminium hydroxide (you can get this at ThrivingPets.com or through your vet). A binder will help deal with the rising phosphorous levels, which currently ill be having a detrimental effect on kidney function.
Hope some of this is helpful to you.
Tony