I Was Diagnosed With Stage 4 Metastatic Breast Cancer That

I was diagnosed with stage 4 metastatic breast cancer that went into my bones in 2010. For the past 5 years, I've had different medications to treat my cancer: Arimidex, Faslodex, and now, this month, Letrozole (2.5 mg) along with Ibrance. Haven't started Ibrance yet because I am so afraid of taking it just from checking the side effects of the drug. Today, I read some reviews and got even more scared! Although I do want my tumors to shrink, I wonder if there is a different medication that won't threaten my quality of life as I believe Ibarance will?