Hi Pepi: First, congrats on giving your treatment as much time as you have to try an improve your t-scores. Unfortunately, for reasons I don't understand, some people don't see improvements after a courageous try. Did your scores actually get worse, or did they stay the same. Maintaining the same score over time is still considered an improvement since you didn't actually lose ground with your scores; most feel if you didn't get worse, then the drug worked to maintain your bones without loosing more bmd. If your scores have worsened I'm really sorry for that since you did all you could.
Your weight bearing exercise sounds excellent so I would ask are you including supplements as well? You need Calcium and D3 in conjunction with the exercise.
As far as what you should do now, is something you'll have to decide with the help of your Dr.
The only other possibilities left on the drug front would be, Reclast (once yearly), Boniva (quarterly), Forteo, HRT, or Evista. Reclast and Boniva are administered via an infusion, and Forteo is a daily injection. Some feel that if benefits aren't seen with antiresorptives, then anabolics *might* be the next step which is Forteo. Of course your Dr would have to agree with this and tell you his/her feelings on trying this different approach. All the drugs listed above *except* for Forteo are called antiresorptives which help to slow bone loss. You may have a situation where you need to boost your bone formation, and Forteo is the only drug that does this. Unfortunately Forteo is expensive, and may not be what your Dr has in mind for you, but you could discuss it with them. Many insurances cover Forteo, but then there are some that don't, so that would be a consideration that's important.
Here's a link on Forteo from the Cleveland Clinic which explains how the drug works, it's a very easy to read paper on all aspects of Forteo. If you want a full list of side effects the FDA pdf on Forteo will give you that. There's also a natural alternative called Fosteum, if you would like to read about that.
Read as much as you can, and discuss all the options left with your Dr.
I hope you can find something that works, since you really have given it the good old college try. Congrats on that, even though you didn't see the results you expected.
Good luck and I hope you can find something that will work for YOU.