Discharged for underactive thyroid?

My husband was recently diagnosed with an underactive thyroid which explains all his symptoms of lethargy, depression, sleep walking etc. Can he get discharged from the air force for this? The doc says it’s not bad enough "yet" to put him on meds, but obviously it’s bad if it’s causing him all these symptoms. What do you think?
She is a military doctor. She didn’t tell us his levels, just that they were low. He has been to a phsychiatrist and they don’t really say anything either. I know it doesn’t "make" someone cut themself but it could make him depressed enough to try it. I am just really concerned and the doc won’t do anything.