Hello all. Two days ago, one of my cats (which I had 9 altogether) died very suddenly. My husband and I noticed that he was just laying around (not normal for him at all) and meowing a little different than normal. We decided to take him to the vet. Being on a Sunday though, we had to rush him to the emergency clinic 20 miles from our home. Once we got him into the car, he started meowing louder and louder. I sped down the road while my husband held him in a towel in his arms. We kept checking on him to make sure he was still breathing because it was becoming more and more still. We made it about halfway to the emergency clinic and he died (right in my husband's arms). I cried and cried and am still crying. It was so sudden. I also feel like I may have caused his death. I'm not sure. I had bought my cats all new flea collars. I accidently bought dog flea collars instead of cat flea collars. Once I opened them at home, I noticed they were the wrong ones. Instead of taking them back and getting the right ones, I decided to use them for the cats anyway. It was two days after that that my cat died. I feel responsible despite the fact that the vet said that the wrong flea collar wouldn't have killed him; all that it would have done was maybe give him an allergic reaction. I don't know. All I do know is that my cat was fine; I put the flea collar on him; two days later he was dead. I'm having a very hard time with the guilt and loss that I feel. I thought that maybe posting a message on this website would help me to relieve some of my guilt. Thank you all for listening. 
I just wanted to let everyone know that read my message that I am starting to feel better. I found out that I did not cause my cat's death. Thank God. My tremendous guilt I felt is beginning to subside. Thank you all for the nice messages to me and for the prayers you said for my Homey. I continue to miss him dearly, but I am getting better (slowly) thanks to the kind words I've received. God bless you all. 