Why does my under arm feel like it is swollen and still numb and tight?

I had breast cancer , had right breast removed, had 27 lymph nodes taken out, expander put in and now have 455 cc of saline put in and going for 850cc. My right arm underneath arm pit has always felt like it is numb, swollen, and tingling. Could this be from the expander or nerve damage or what? I get measured and arm is not swollen from lymphademia. Any one else have these problems?