Am feeling your pain and remembering just how I was feeling 2 years ago; wine in the evening definitely helps
It brings home to me though how I'm going to be feeling this time next year when it's DS's turn (and not knowing the new format really isn't helping!). I won't lie to you that the week will fly by unfortunately, but it is the biggest relief in the world when you get the results, just to have more of an idea where you stand, before every parents' nightmare of next stage of waiting until March for school allocation.
Try to work with the "what will be, will be" philosophy because things very often work out well in the end, even if it's not the path you intended (in no way religious, but it's just something I've found many times in my life).
Wishing you all well.