Mastectomy surgery

Hi...I need to get some ideas on coping after mastectomy. I had a bilateral mx with 13 nodes removed. Prior to this I had 3 rounds of FEC to shrink my large lymph node. Best news...a necrotic lymph node with no sign of cells in other lymph nodes and the surgeon could not feel or find the 4cm lump in my breast once removed. Has this happened to anyone else in here at all? Of course I am completely overjoyed by this news. Its now 2 weeks after my surgery and honestly I am finding the discomfort increasing each day, particularly in the evenings. I,m not doing anything strenous apart from moving about the house and walking each day for about 20minutes? Any advice on how often I should be doing my arm exercise at all? Have been managing pain with panadol however have a script for stronger med and considering it for the evenings. Anyone care to share how long their recovery was after such an operation? Most days it feels like certain muscles in my armpit and chest are golfballs that want to.pop open.