I feel your pain on this. The vet who mismanaged the healthcare of one of my pigs was recommended to me by a family member (who had a dog... I'm sure he was totally fine with dogs and cats but had limited guinea pig experience.) It was urgent so I went with the recommendation without much shopping around. I asked him if he had treated this issue with guinea pigs before and he said yes and I took him at his word. In the end, things did not go well for Frenzy (the pig in question), and she never recovered well from surgery, never was put on appropriate antibiotics, and I was never given ANY instructions on aftercare, and in the end she didn't make it. In the wake of this experience, I did find this forum and my knowledge as an owner increased exponentially with the support and info I gained here, and I did find a wonderful vet who actually regularly treats exotics and has actual experience with guinea pigs clinically and surgically, and a couple years later we actually managed to nurse one of my current pigs, Sundae, through the exact same issue that cost Frenzy her life, so I'm thankful that through what I learned with Frenzy, I was able to help another ill piggie to recover and go on to live to a ripe old age of over 6 (and still doing well.) Anyways, I have a lot of empathy with what you are feeling and I have been there. I still feed bad about what happened with Frenzy. She was a sweet girl and didn't deserve to die like that. But at the same time, I know that I did everything I could for her at the time and I thought I was getting her competent care. When you know better, you do better... but I did the best I could with what I knew at the time, and now that I know more I can do more and ensure that the vets I trust my pets to also know more and do more. ((HUGS)) to you.