Fresia67, look at the website of Amoena, as they do the widest rangeof prostheses i have come across, including for boosting where there has been WLE and radiotherapy. My surgeon was not involved in any of the decisions re prosthesis, do you have a breast cancer nurse who can help you with this? Or ring the Helpline? This really does not seem right, it is very demoralising being lopsided.
Wishing you luck with this!