You are a very good and smart, level-headed cat mom, Claire. I understand how scary a hypo is, having gone through it once many years ago now, with my first sugar cat.
You did brilliantly. Be sure to get some dosage advice from the knowledgeable people here, as maybe somebody knows more about Porus One, and can help with the CKD.
Best wishes to you both, and a calm and restful night ahead.