Pain 2 years after Treatment - Possible damage from Radiotheapy

Hi Jane, just read your post.  I finished chemo/Radiothreaphy last July.  About August I had pain opposite side to lumpectomy, which was on the left breast. It was upper abdomen/lower ribs. It was extremely sore to touch, uncomfortable to sit & not so bad walking. After many tests and different medications my GP put me on buscopan as she, as well as a specialist, believed my stomach was going into a spasm. I'm almost scared saying this but for the last four days the discomfort has eased. The pain/ discomfort was like when you are pregnant and the bubs foot is stuck in your rib cage. 
Dont know if this information is helpful, hope so. 
Anne-Marie. X