Hi ShazS. I had same op, Lumpectomy and sentinel nodes. I had no pain after surgery and was asked scale of 1-10 and I said zero every 4 hours. Nice to know there were pain options if needed. I did overnight in hospital. I started physio exercises the next day and continued those religiously. I haven't had any pain anywhere. Sometimes just a weird sensation from time to time but that is about it. All the best for your surgery.