Is my Zometta treatment realy necessary?

I was diagnosed with insitu ductory cancer of the breast. I hada lumpectomy in 1999I was put on tomoxifin for five years.At that time I was diagnoswd with pre-osteoprosis following a bone scan and was then put on Zometta injuctions once a month for two years and now am getting them once every six months. I was told this would build bone and prevent my osteoporosis from advancing further.

I have been experiencing severe bone and muscle pain , also have not received the testing this site recommended prior to the injection.

My question is, is this realy necessary?

Lois Scott