My cat died after the vets' treatment and I can't stop feeling guilty, please dua

As-salamu alaykum. I’m really struggling and just needed to share this. My cat died after receiving treatment from vets and it’s crushing me. He tried so hard to survive. The first vet gave antibiotic injections that turned his once-healthy state into a severe illness, and the second vet couldn’t help him either. Both of them failed my poor baby. He was strong and lively - even ten minutes before he passed he was trying to move and breathe. I keep blaming myself, thinking it’s my fault for taking him in. He only had a mild cold or maybe a hairball, nothing serious - he was always so healthy. I thought the vet visit would help him feel better, but instead it seems they took his life. After the first injections he stopped eating, lost his appetite, and had no energy. He became completely different and was in so much pain he couldn’t breathe well. I went to the second vet and paid so much hoping for a cure, but they couldn’t save him. I prayed a lot for my cat. I read Quran, made duas constantly, asked Allah to heal him, but he’s gone now. I don’t feel okay. I’m traumatized. I keep thinking, “what if I never took him to the vet?” Maybe he would have kept eating and breathing and recovered on his own. Instead, wrong treatments and lack of help left him fighting until his heart gave out. The pain won’t stop. I don’t know how to cope or how to ask Allah for help after all this. Part of me wants justice against those vets and part of me is numb from grief. I ask Allah to grant me strength, but I keep breaking down. I can’t understand how people could be so careless and do this to a helpless animal. He suffered because of them and a part of me can’t forgive. He was full of life before those injections that I believe hurt him from the inside. Burying him was unbearably painful. The grief feels endless. My healthy, happy cat lived full of life and in such a short time, because of careless actions, he became sick, suffered, and died. Knowing he didn’t have to go through that and was harmed by people who should have helped is a weight on my heart I can’t explain. I relive it constantly and it’s the worst pain I’ve felt. Please don’t reply harshly - I’m already in so much pain. I just needed to express how I feel. How can I ask Allah to heal my broken heart? What can I do to find strength and move forward? Any gentle words or duas would mean a lot. JazakAllah khair for reading.