Since installing the 6.1.2 update my battery life has halved, what can i do abut this?

This is so frustrating!! I see people getting 12 hours out of their phones and I would be HAPPY about that! I literally get 2 hours at most, and have always gone ALL DAY at LEAST before needing to charge. This is unacceptable!! What do I do?? I'm terrified to do a restore, because it always says I'm going to lose everything on my phone. I am always sure to close EVERY applicaiton right after I use it, and only use my phone when I HAVE to since this started happening (IMMEDIATELY after the 6.1.2 update). I can't go all day without my phone. I'm a full time student, and pregnant mom of 5 kids. What if I have an emergency?! I bring my charger with me when I can, but it seems like my phone also takes FOREVER to charge! This afternoon I had it plugged in for 2 hours with nothing open on the phone, and the battery only went up 15%!

I've also noticed that if I make a phone call or I'm texting, the little circle starts going around and around like it's working on something. Someone said maybe it's looking for a hotspot or something. It also gets burning hot like I'm running an app when absolutely NOTHING is open on it.

Apple has GOT to do something about this!

Just an FYI, I have been on with Apple "support" for over 2 hours (I've lost track of time, it could be more like 3 hours, but you can probably tell by the time of my last post). It is 100% a problem with this update, but they are happy to keep me doing stupid backups, resets & restores all night. This might be enough to get me to switch to some kind of windows device.