Whats making my teeth hurt so much?? and what do you think I should do?

That's a lot of work to have done, I wouldn't expect it not to hurt! My dad is a dentist (DDS) and my mom works there, and they are always telling me to never let a cavity get so bad that you have to have a root c, because even though the root c procedure stops it from getting worse, there's already a lot of damage done, and will be very painful. From what I recall, the pain is really bad in the beginning, and slows down eventually, meaning, you'll always have pain but not as frequent. Crowns are necessary, but they don't last forever. I think the longest a crown will last is 10 years, but a lot of people crack them off from biting on something too hard, and that's painful as well, and they have to go get it fixed. Sorry if this info doesn't give much hope! Take care of the teeth you still have. It's not the Dentist's fault you have pain, you should have practiced better oral hygiene, but always get a second, or even third, opinion!