I was inpatient for several days in September, after several days without sleep, hypomania, anxiety, and unrelenting migraines.

At work, I said that I was hospitalized due to thyroid issues.

I do actually have hypothyroidism (due to Lithium) and I did take time off for that in 2011, so it was sort of a not-quite-lie, and when you are telling something that is closer to the truth than saying that you were abducted by aliens but then returned to the Earth... for me it is easier. For me it is easier to stay closer to what actually happened to you. But you can cite any other reason - your illness, as Christina said, is nobody's business. I am just saying that for me it was "fluid" to stay closer to the truth.