I kinda feel like this, but I have 3 more A2 exams left with one tomorrow. It may be that you are so mentally tire and stressed from your exams. You need to go out with friends and watch a film or go for a cycle ride, do something active and relaxing. The other problem is that your likely to be waiting for the results which are in august and you may or may not think you have done so well as you would like to do so your dreading your results.
If I were you then I think you should plan your holiday a bit so that you forget it, eg) I went youth hostelling in sumer last year in the lake destrict with my best friend. This year im goin on a ...choir trip to florence and spain for 2 weeks with some friends. Apartt from that I will probably meet up with friends quite a lot and do some excersise.
After my last 2 exams I plan to go bowling with friends, why dont you cellebrate and rest?