Underarm pain?

My surgery was 4 months ago now, I had a bilateral mastectomy after DCIS was found on the right side. I had 3 lymph nodes removed from the right and one from the left. I've started feeling a sort of pain under my right arm, it's hard to describe, it sometimes is like a jolt of pain other times its just a funny heavy feeling. I do not have any swelling at all, and the pain doesn't run down my arm or anything. I am seeing my Doc on Thursday so I will ask, but just wondered if anyone had similar. Many thanks Jo :-)