Breast pain

Hi

Not been on here for a while. Had left mastectomy last year. Check my other breast 2/3 times per week. I tend to wear just a normal non wired bra during the day(the back part has become little tight these past few wks) and since then when I take bra off on a night my right breast aches particularly top of breast...I've had really good feel and cant feel anything (awaiting my first mammogram as I write this)...just wondered if anyone else had similar symptoms?

Thanku Dannii xxx