Thanks for your inquiry, but without directly examinging you it is impossible to advise. An uneventful, successful breast recovery can have both breast recover slightly differently. You should call your surgeon ASAP and discuss your symptoms. Good Luck.
As you heal from your surgery, you might feel weird sensations. Those you describe do not sound strange. If concerned, best to review with your surgeon in person.
Under breast crease discomfort
Dear ljp, Without pictures or examination it is difficult to give you an intelligent answer to your question. If the tender area feels like a cord, it might be thrombotic vein. That will go away with time, 2-3 months. You can alleviate the discomfort by stretching massage of the sore area. Obviously, discuss it with your surgeon before you do anything, to make sure that you do not have other issues like infection etc. All the best, Dr Widder