I m 37. I m going 2 go if i don't feel better after next week. I m surprised your SIL hasn't told them just to take it all out. That is unbelievable.
You didn't mention your age, but you might must be getting into the peri-menopausal symptoms. In my family, all that started very early - like our early 30's. Ugh! It sounds like a possible hormonal issue, perhaps even thyroid, so I'd start with your gynecologist to find some answers.
Also, you could still be pregnant, but tested too early. It wouldn't be the first time a TL failed. My sister-in-law had a TL, and a fragment of an ovary left. Yup, she got pregnant several years after the surgery. After she delivered, they re-did the TL and "cauterized everything" and.... yup, pregnant again. Unbelievable.