I Have Been On Arimidex For 9 Month Now. I

I have been on Arimidex for 9 month now. I started getting a sick feeling a couple of weeks ago. Increasing progressively. It is the same feeling I had when I went into liver failure after my double mastectomy . I had CBC and CMP today. I will get the results tomorrow am. I have read much stuff about breast cancer these last few months. I don't know if I could take feeling this way for the next 4 years 3 months. Stage 2 DCIS hormone receptive. With an invasive component. Onco type only 5 for invasive component. 0 on the DCIS part. After 5 years on medication to only cut rest in half??? Is it worth it?