Did you get an oncotype score? Do you know what your risk of recurrence is? Maybe rads but no Tamoxifen? Maybe tamoxifen but no rads? Maybe neither? Maybe both? TOUGH QUESTIONS.
Sounds like your DCIS was estrogen receptor positive. Do you know anything else about your DCIS?
Definitely, I think you need more information before you can make an informed decision with which you can feel peace. Minimizing side effects AND recurrence risk = good.... But it is a bit of a balance, I think.
Don't know if that helps at all....
Good luck. I hope you are able to come to a decision that is right for you.