I'll never be a vet

Or for that matter a vet tech. Last night I went up to check on the ferrets. The one with the insulin problem has been doing really well. The other one has been getting really fat. I'm not sure why but she has. Anyway, I gave them some fresh water and the lighter ferret (the fat one) got up and got something to drink. Every thing seemed good. I went and sat on the couch. I then heard banging around in the cage. That's weird , so I went to look. The light colored ferret was having difficulty walking and kept falling over. I took her out but she just kept trying to get away from me and I was afraid if I let her go she would get under something and I wouldn't be able to get to her. So I put her back in the cage. It was tortuous to watch as she flailed around in the cage and finally landed in a heap in the bottom corner of the cage. Her head and neck all distorted. It was horrible and I figured she was dying. I shut the cage and went down stairs because I just couldn't watch this poor thing die. I text my husband who was at a dinner meeting and told him he had to come home and help me because the ferret was dead. So he came home and I got a box. We went back up stairs and the ferret was now sleeping in its bed again. OMG, it wasn't dead. I couldn't believe it. It must have just been having a massive seizure. I'm sure my husband thought I was an idiot. There didn't look there was any thing wrong with her. So now what do I do. These poor ferrets , what next. ( That's why I couldn't be a vet, I cant even tell when an animal is dead). When my cat dead a few years ago, she just keeled over and that was that. I still took her to the vet to make sure. I told them," I'm 99.9% sure my cat is dead but can you make sure."