Hi, I Am A 43 Yr Old Female With A

Hi, I am a 43 yr old female with a hx of breast cancer. I was diagnosed with stage 1 in 2001. I also had full hysterectomy in 2014. So I have had 15-25 hot flashes a day and tired. I started having severe joint pain 2 months ago including shoulders, elbows, wrists, hips, knees, ankles, upper neck and lower back. I went to doctor last week. She ran some blood work CMP, and checked thyroid levels and arthritis inflammation. The blood work is all normal, still waiting on results of bone scan, mammography and ultrasound due to a cyst in the right breast that has been aspirated twice and keeps coming back. I had a lumpectomy and radiation for the left breast cancer in early 2012. Any ideas what would be causing me such all over body joint pain?