Drug absorption after gastric sleeve - especially aromatase inhibitors

I went through every step of preparation and was approved by insurance. Just before fixing the operation date, the doctor refused to operate me. He had issues that Aromasin (aromatase inhibitor) that I need to take after breast cancer in 2016 maybe would not be absorbed well and could cause a critical situation. What are the doctor experiences? And what do sleeved patients do, when they get breast cancer AFTER been sleeved and need to take aromatase inhibitors or other drugs afterward?