Cat heavy breathing and not drinking water - blood analysis

Hello everyone, My cat has been breathing quickly (100+ breathes per minute) at rest, and sometimes even panting heavily. A lot of cats in her family died or has been suffering due to kidney diseases. She displayed a lot of lethargy, lying continuously on the ground and looking very tired, but most importantly she is not drinking water at all. It is pretty hot here in Italy (average 35 degree celsius at home), and she is not drinking water. We brought her to the vet, which sedated her and did an invasive blood draw. There are a lot of values that are outside the proper range, but the vet suggested to just give her a supplement called "Renal Combi" (https://www.amoreanimaleshop.it/candioli-dog-cat-renal-combi-in-polvere/) The vet seemed pretty dismissal and he has not a good history of medicating successfully my previous cats (they all died due kidney diseases). I'm really nervous as she is displaying clear signs that something is not good and she is around 13 years old. I attached here her blood analysis. Apologies that they are in Italian - please ask me if you need the translation of any term.     Thank you so much in advance. I  have not been able to sleep for the past week and if you can help my cat it would mean the world.

Hello - this is a heartbreaking scenario.  Your cat sounds to be poorly and you dont seem to have the reassurance or depth of explanation from your vet that you beleive in them.  Unfortunately I am not in a position to examine your cat, have little idea about her hydration status or even why that blood glucose is high - is there diabetes, or simply stress?  Nor can I tell from here what to make of the breathing problem.  Therefore, we are not allowed to give second opinions and I think that you have two choices; to ask to be referred to a specialist or continue to quiz  your own vet.  Good questions may include - How do you know my cat is in renal failure?  Have you done an IRIS test including a specific gravity (test on the urine) to back this up?  Are there any other differentials (possibilities) at this point?  Would fluids be useful? I hope that you get some of the support that you seek.