Back pain is the curse of mankind. Its more prevalent than ever with rather taller people everywhere. Pain is the body's way of saying "REST me care for me"
Basically you want a strong back.
Getting heat to it is a start, heat packs, heated pools, electric blankets. A massage and seeing if that helps could put you onto a cause that is muscular. You can go to a muscle manipulator and see if pressure can be taken off a possible pinched nerve. Acupuncture is giving some people miraculous relief.
If the damage is compressed discs you could go to metal inserts across several discs but surgery risks are significant (up to 50%) of losing the control of some organs eg bladder.
Medicine and Health are both improving so fast there are bound to be new approaches most of us are unaware of. There are huge amounts of informations online. Keep trying alternatives until one works for you.
Well, turns out heat is not good for you back so don't that. Pain pills keep the edge off if it gets really bad and uncomfortable. A chiropractor is loads of help! Seriously, you will feel new again. Could be your period?