Extremely Hormonal And Breastfeeding. Opaque Flesh Thing During Periods. Obgyn Has No Idea. What Might This Be?

Hello, I gave birth to my one and only almost 3 years ago. I have been extremely hormonal and still breastfeeding 2 x per day. About a year ago I peed out (1-2 weeks prior to my period starting) a white opaque flesh thing. It looked like toilet paper, but it wasn t. It was definitely some sort of tissue/lining from inside of me. When that happened, I felt like a normal human being for the first time in 2 years since giviing birth. I was happy and helpful to my husband. I felt amazing. But the feeling of wellness only lasted for 1 or 2 days. Tonight, the same thing happened. And I feel awesome. My period start day last month was Oct 27th. I have been to obgyn and naturopaths and they all have no clue. I would love for some insight so I can possibly fix myself. I would love to be permanently normal again vs. 1-2 good days once a year. We are not trying or wanting another child, and I am in no way pregnant at this time. Wondering if this could be something left from birth or shdding lining for some reason or another? And it must be hormone related since I felt awesome for a day or two after both times. Wondering what this could be.