Living in fear of my own body

My mom and grandmother both have hypothyroidism and are both overweight or obese now. I used to struggle with restrictive disordered eating and now I’m mostly fine and am maintaining a healthy weight, but I still live in almost constant fear that one day my thyroid will destroy me. Anyone else have thyroid disease running in the family? Are there periodic tests you can get (like the periodic tests for cancer when cancer runs in your family)?