Can you have breast cancer twice? Facing chemo at 69 with anxiety

Hello everyone I had Breast Cancer 17 years ago low stage 17 years later diagnosed with HER2 negative Stage2 Breast Cancer,I just made 69 years old the anxiety,sleepless nights, staying up overnight,dry skin etc. is real. I recently had Port placement and reality has kicked in I'm starting Chemotherapy Infusion Monday morning December 8th 4 rounds ,rest a month,then Radiation. The decision to have Chemotherapy this was Oncologist suggested but left decision open, prayer,and late night hour thinking. I'm anxious my Dr. had the pharmacy send over a small dose of Paxil. I'm going to be fine.