Having treatment for breast cancer that has spread to spine - is it worth it?

I have recently been diagnosed with stage 4 metastatic breast cancer which is also in my spine.  I have been told it is not curable, but treatable using hormone therapy.  The side effects are very unpleasant, and as this will only slow down the cancer cell growth  not get rid of it, is it really worth going through all this for the end result to be the same.  My initial reason for having MRI etc was increasing pain in spine, loss of balance, weakness in legs and arms, and this treatment will only make the pain worse and have no benefits.  Please advise