Hello Thanks for writing to us with your health concern. You should consult a gynaecologist at the earliest. With 3 previous surgeries, any kind of irregular bleeding should be investigated. You could be having a fibroid in the uterus, or thickening of the lining of the uterus ( endometrial hyperplasia ). Also, there could be adhesions or cysts. After childbirth it does take a few months to resume normal cycles. This is more so if you are breastfeeding. However the spotting and extreme pain should be looked into. PLease have a gynecological consult - internal examination - per vaginum and per speculum. ALso a pelvic and abdominal ultrasound scan . Continue the thyroid medications. Also, have your calcium and vitamin D levels checked , as their deficiency can lead to back pain. It could be pain due to injury from the multiple spinal anesthesia given to you. ALl the best. Take care.