Hi shamon, really hoping that will help. Sometimes it can appear from nowhere, but that doesn't mean it has to stay.
Perhaps your T is thinking that you cope with/manage/handle so much (sometimes without realizing it) through the days, that it can come down to your mind telling you "enough's, enough!" and you just need time to rest, recuperate, "regroup".
So go easy on yourself, and if there's anything more you can do for you in general e.g. reduce the pace, give yourself more time to rest or do things you might enjoy, then go for it!!
But if you want to talk, as you maybe already know, there are plenty of people on here who will understand what you're going through, and who can offer you some support.
Alison