I am so sorry to hear this, but if it makes you feel not so alone, many people who've had a compression fracture have this problem. When one vertebra fractures, it puts pressure on the adjacent ones. If the bones are already thin or thinning, they too will fracture under the increased pressure.
You're doing the right thing with the Forteo. It will grow you new bone. It is important that you take a bisphosphonate when you finish the Forteo to strengthen your new bone.
I also would suggest getting with a physical therapist for some exercise to strengthen your back muscles to further support your spine. Also double check your calcium consumption that you're getting 1200 mg spread out throughout the day. This is the time, when you're on meds that need calcium in order to perform, that you really need to make sure you're getting that calcium.
This is the point I try again and again to stress to those who "are doing fine and have never had a fracture" who shy away from the meds. There is no turning back once you fracture. It is very painful and it changes your life. There are times when you need more help than the natural approach can give you.
The more you move (correctly - no bending or twisting the spine) and the more those back muscles strengthen, you will get some relief. I wish I could say that doing those things would end or better, reverse, your problems, but I can't. You will always have problems, but overall your pain should be better tolerated.
In addition to the muscle strengthening, you would also benefit from PT instruction on ADL's (Activities of Daily Living.) They can show you how to get into and out of a car, grocery shop, do housework and/or gardening, sneeze, etc. in order to avoid another fracture. This should also give you a better path to becoming active again, but safely.
I've seen several dozen women like you who've gone through our rehab and education classes who swear that their quality of life has improved simply by doing these things. It's very important to them. On the flip side of the coin. we have lots more who say they wish they'd not waited so long to do something when they learned they had "only osteopenia."
Please keep up apprised of your progress (and you will progress). You can also look at the NOF website (
www.nof.org ) for an osteoporosis support group near you.