Hi, it's only 4 months since I had the lower half of my left lung removed but I too get pain on the side of my left breast, it's not sore to touch but feels like a stabbing/burning pain in it and I sometimes struggle to get comfy at night if lying on my side. 
 

My consultant told me this was normal after major surgery as your body is adjusting and that it can take up to a year to recover, although I appreciate you are saying it's been over a year for you now and there is a chance it could be permanent. I also still struggle to wear a bra but was hoping that this may become easier over time.

I did used to have pain in my left breast before the lung cancer was detected and worried I had breast cancer but I went to my GP on 3 separate occasions about it over a few years and had mammograms and ultrasound and nothing was detected.  I did have an irregular heartbeat that was picked up last year  and I also wondered if that was connected - it was when I had a heart CT scan that they picked up the lesion on my lung (heart was fine and I'm now back in normal sinus rhythm).

Not sure this is giving you the reassurance you were after ... but I too would be interested to know if other are/have experienced breast pain after a Lobectomy.

Best wishes

Ruth