I completely understand! There are days I feel the same way - about chickens, about my career, about lots of things. And I'm pretty new at this and haven't suffered any losses... yet (knock on wood).
You need to do what is best for you and yours. But if you choose to make a run, I will tell you that I managed to build a coop for under 50 bucks using recycled materials. My pen was store bought, but I could have made one on the cheap using recycled materials. Hit up craigslist or facebook or neighbors. I'm sure others on here have ideas, too. If you choose to pen them, they'll deal with it. Give them a good ol' dose of tough love. Maybe tot can let them out a bit every once in a while. Maybe there's a compromise to be found somewhere. They def need to be cooped up at night.
I am sorry you have had such negative experiences. But Blooie is right (as is often the case): it's a personal choice. I wish you luck. I'd probably be having the same concerns if I'd gone through what you have.