Breast Prosthesis / Prostheses - Support Post Mastectomy

Until recently I went to get evaluated for a prothesis and realised my sore neck was from not wearing one! But having a lil problem as my surgeon took a fair bit of tissue leaving me with a lil concave area where the prothesis has to go. And as I had 17 lymp nodes removed after radiation the swelling has not gone away. Regardless of the exercises recommended by the physiotherapist. Anyone else got this problem?