Hello. Welcome to our User Group, though I'm sorry you feel a need to be here. First things first, what's your dog's name? It makes it easier to respond with support and/or suggestions.
Please ask your vet for copies of all the tests you have had done. You own these reports. You paid for them - and you need them. Once you have them, please let me know the results for phosphorous, calcium, sodium, amylase, potassium, WBC, RBC. If there are any particular blood results that are marked abnormally high or low, please let me have them in addition to those above. If you have a urinalysis report, please give me the results of that too.
The IV fluids were the right thing to do - but they must be followed up with SubQs, which you can continue giving at home (probably for at least a month). Daily doses are the best. Once your vet gives you the dose he is recommending, let me know the weight of your dog and the type of fluids he gives you - and the dose he prescribes.
There's lots you can do to help prolong life and improve quality of life, though it's never a predictable journey. Did your vet check blood pressure - if not, it needs doing. 90%+ of dogs with kidney failure also have high blood pressure, and that can increase the deterioration rate of kidney failure. Treatment is a must in such circumstances. Again, let me know the result and I will suggest the best medication.
Finally, please have a read of my article (link below) which will help get you off the ground running with ways to manage the disease from here onwards.