Synthroid and breastfeeding

Hi! I was put on synthroid while pregnant and once I had the baby, my OB told me that they could no longer treat me for that even though they’re the ones who put me on the meds. 😑 Anywho, my pcp kept me on the same dose, but am wondering if it should be adjusted and if anyone else stayed on the same dose after giving birth? I’m 5 mos pp and not sure if this dose is too high for me now and causing anxiety and insomnia (I can’t even sleep when the baby is asleep) or if it’s just me being anxious.