I got lymphedema in my arm and breast unfortunately. Annoying as I had only three lymph nodes removed. My arm is currently controlled by a compression sleeve, the physio says my breast may improve in a year or so. Lymphatic massage works well on me and is painless and soooo relaxing. I am seeing physios they seem to be the experts. I am trying all sorts of things for the breast lymphedema, including taping it, a gel dressing in my scar to soften it and the massage.
Anyway sorry to hear your bad news.
Yes the worst is we want to move on from the Cancer and this is a reminder of it. There is no quick fix either, it has to be managed. Daily. Which is a pain. I can't make myself do the excercise which you are supposed to do four times a day! Stupid of me, but there it is. Maybe one day I will have the self discipline to do them.
Good luck, I hope it settles down for you soon. Karen.