Irregular Period, Fibroids In Uterus. Done Vaginal And Pelvic Ultrasound, Endometrial Biopsy. On Progesterone. What Now?

I am 39 and in the last six months I went from having normal periods (I've always been regular, like clockwork) to a really light period one month, then a heavy period the next, skipped a period, light one again, then I had two 3 week long periods. One started normal, started getting light, then suddenly heavy again for a day, then light, then heavy again and so on. This was the case with my last two periods. Went to GYN and she had my blood tested and vaginal ultrasound and pelvic ultrasound done. My results of the blood test showed .6 for progesterone, 15 for iron, and a low Vitamin D count (don't remember what number she told me) I am now taking iron and Vitamin D supplements as well as 200 mg of progesterone daily. Mu ultrasound showed two small fibroids on the uterus and an enlarged uterus (20cm) and a very thick lining. She did an endometrial biopsy right then and there. Nurse called and said biopsy shows no cancer, but Doc wants me to come in and go over the results. What could I expect? I am so scared.