Have Heavy Menstrual Flow After Radiation Treatments. Should I Eat Something To Compensate The Loss Of Blood?

I am a breast Cancer Patient, I've completed my Cehmo/Radiation treatments almost 1 1/2 years ago, I was told that I probably will not have a menstrual cycle again, due to my age (43), however.....I started my cycle last month and it was extremely heavy, I figured it was the first cycle, in over a year....so maybe that was normal. I'm having the same issue now, with the heavy menstrual flow....and I am very weak, and nauseaous, arms and legs feel heavy, Should I be eating or dringking something to compensate for the loss of blood? I've made an appt to see my GYN, however, that appt is not for almost 2weeks.