I am so happy that things ended well for you technodoll!
I am offering this peice of advice in the spirit of really wanting you to never have to go through any of this again:
Keeping animals is not an intuitive activity most of the time. Thousands of years of a learning curve got humanity where it is now, and animal husbandry has much to improve even now. Yet the lure of animals, and the the excitement of them lure a lot of people into getting as many as they can as fast as they can (I am guilty in the past of doing this exact thing).
But something that will help you IMMENSELY in the future is research, research, research, research. Preventative measures are worth 50 times the amount of fixes. Preventing mites is SO much easier than getting rid of them. Introducing your coop to your girls in the right manner that works with their instincts is SO much easier than trying to force them in a way that goes against what they naturally do. Knowing ahead of time the realistic number of chickens you can handle ahead of getting them is SO much better than being overwhelmed and taking it out on your birds.
I really feel for your pain, but when you say "Man! This heat is giving me a headache and I'm mad at my girls for bieng difficult!", stop to think "Hey, if I'M hot and miserable, so are my girls. They don't even get air-conditioning, and probably are really upset that this screaming giant is bullying them around in this heat. I'm probably lucky they don't have tiny chicken guns."
I know it's hard, but please please please don't get mad at your hens when it's a situation where a little bit of research on your part could have prevented the situation. It's not their fault in any way shape or form, even though they're a tempting target. That's the responsibility that people take on when they decide to have animals. You're the higher being with reasoning and resources that they don't have.
Again, I'm not trying to criticize you, and lord knows I've made the same mistakes. Just trying to help you make your chicken experience a better one, so you can relax and have a glass of wine more often
.