Down...and basically out

Dear DS diary,
From an anxiety standpoint I am effectively down and out this afternoon.  I can feel my heart becoming weak and a breakdown coming on, and there is nothing that I can really do about it.
At this point, it's no longer a matter of whether I pass my exam next week, it is now a question of how much of a failure the try is going to be.  I feel so discouraged that even though this afternoon is for the most part free I will only be able to manage a token review try at best.  I might try to do a practice exam Saturday if the afternoon is open.  But that will probably be the extent of it, because the way my work weeks have been going no further openings will be coming.
My heart just can't take any more.  The fears are too much.  I am for all purposes done trying for the immediate future, it seems. :'(