Our LA form asks for the number of periods of absence in the last 3 years. Then, if there are any, you need to give the duration and reason. To be honest, some schools will exclude you, if all else is equal, for half a term off. Others, like mine, don't actually read that far through the form before shortlisting. We only look at the current position and the supporting statement part before interviewing. We'd look through the rest if there were concerns from the current post or if two candidates were equally good at the end of interviewing. You do need to answer and you do need to be upfront with a short reason why. Don't go into details. Just put something like 'Six weeks absence; situational anxiety.' And leave it at that, unless it specifically asks for more.