I Have Beeen Experiencing For The Last At Least 4

I have beeen experiencing for the last at least 4 years periods of General malaise dull headache and slight nausea, it comes upon me every month at least and lasts 2-3 days, I have a HX of breast ca in 2004, I have had recent BW BMP CMP etc and all is WNL. 2 years ago I met with an oncologist and had Oncology BW done thinking perhaps CA had returned. I am neg for Lyme. Any thoughts??