Do you like magnesium, maybe in the glycinate or sulfate form (Epsom Salt)?
Do you have the thyroid test results, including reference ranges, that caused the doc to prescribe thyroid meds? Was that just synthroid--T4?
You might find this interesting on relationship btw thyroid and adrenals. Some think it is often wise to begin supporting adrenals before adding thyroid meds. https://stopthethyroidmadness.com/adrenal-info/
Did you take any selenium along with the thyroid med?