Thyroid after childbirth?

Chelsey • We beat infertility! Valkyrie Ember 6/9/20🎀

I have hypothyroidism with hashimoto's which was managed all of pregnancy. Now I am 6 weeks postpartum and increasingly each day since childbirth, I've had headaches, brain fog, and muscle fatigue. I feel like I cant get enough sleep. Sleep comes in 3 hour bits at night adding up to plenty. Exhaustion is obviously normal with a baby around, but this feels way worse. Anyone with experience a change in thyroid function after birth?