About a few weeks ago I noticed my favorite 3 year old rooster George (a bantam D uccle) acting very sad, tired, and losing weight. It was extremely cold outside so i brought him in the garage with a heat light, I thought he was just cold so I let him be for a couple days. I picked him up and was looking him over and noticed scabs on his comb and on his missing eye hole (when he was a chick he got an infection in his eye and lost his eye) I saw little red mites crawling all over the scab on his eye hole and I was shocked. He had mites all over his ears, and all around his neck. He was covered in eggs too. I started searching all over google and immediately gave him a bath with dog flea and tick shampoo and dusted him with diatomaceous earth. I continued to dust him with it for two weeks and it seemed for a while like he was getting better and he even crowed for the first time in a long time (he hadn't crowed since we got a new rooster). It even seemed like the mites had gone away and he was better for a while until he suddenly got worse two days ago. He stopped eating and drinking and wouldnt move, I brought him in my house and warmed him up by the heater and got him to eat a little and drink some water with poultry vitamins in them. He started perking up and walking around and clucking at me. the next day the same thing happened so I brought him back inside and got him to drink and eat and then I noticed the mites hadnt gone away they just moved to his vent so i dusted his butt with DE. Later in the day he started having diarrhea. I woke up this morning and went to check on him and he was laying down and wouldnt move or open his eye but he was still alive and breathing. I made him a vet appointment and while I waited until it was time to take him to the vet he woke up and started standing and when it came time to take him to the vet he completely crashed and wouldnt stand or open his eye or move. On the way to the vet he started trying to flap his wings a few times and kept moving his head and neck like he couldn't control it. The vet said his heart beat was under 100 bpm when it was supposed to be over 200 bpm. He said the mites were definitely contributing to making him sick but it could be something as well and whatever it was was effecting his brain which is why he was moving weirdly. He was going on to tell me how it was too late and there's nothing he could do when George started freaking out and then dropped dead right there on the vet table. Im still crying from it he was like my best friend and he was just the sweetest chicken ever. I got home and checked my other chickens to make sure they didn't have mites as bad as he does but sure thing they all have them and one rooster Bruce has them bad around his vent. Please help me get rid of these mites!!!! The vet said something about a deworming shot to get rid of them and im willing to give them all shots myself if I have to.