I Have Had A Stent For Three Years. I Had

I have had a stent for three years. I had Chemo therapy for six months but I still have my stent, in case I need it again. My Cancer did reoccur in my lung but I am not having Chemopathy. The nodule was removed with clear margins in Nov. 2014. I have been faithful in having my stent flushed. However, for several months I have experienced pain in n my neck and pain in the area of my stent. Should I be concerned and how long is it OK to keep the stent? My Cancer is Transtition Renal Pelvic Diesse and I am still alive. My kidney was removed in 2012, a bladder cancer mana feasted in my Kidney.
Thank you