> First, "sick days" generally are a policy for handling acute disorders; e.g. last week I didn't have disease X, today I do, and next week I'll be healthy again. You can't "wait out" a mental disease; taking a day or two off may reduce elevated stress levels but that is not the disease, the underlying problems aren't going to be solved when you come back.

In the UK time off to manage a long term condition could be justified as a "reasonable adjustment" under the equality act.