@Sheeba
You’ve had very bad luck. The options your surgeon proposed at the outset seem completely reasonable, most people would choose a lumpectomy over a mastectomy all factors being equal. So it’s important you stop
agonizing over a ‘wrong’ decision. You made a sensible decision with the information available. Now unfortunately you have more information.
If a third excision is successful you may still want to consider some reconstruction. Is that an important step for you? As @Mez_BCNA has said, you may find the Reconstruction Group helpful, others may have had to make a similar decision.
While your wish to have the cancer out is normal and sensible, it’s also sensible to be confident in your decision, as much as possible. The ‘tick sheets’ are a good idea, to help you work out what you most need to know, and reduce your anxiety about your choices. Best wishes.