What's happening after mastectomy?

[Moni]

My best friend and sister-in-law got diagnosed in April with her2+++, has gone through chemotherapy and received Herceptin. Thank God, the tumors they had originally found were minimized to almost gone, last week she had a single mastectomy. According to her doctor, she doesn't need radiation although they removed 21 lymph nodes (one of which was cancerous).
I would like to ask you about your experiences after mastectomy, any special treatments, mood swings, depression, any food for thought is highly appreciated.

Thanks so much,
Moni