Crem, it definitely sounds as though doing something completely different would be a healthy move. What would you like to do?
Uniform trashing is a chronic condition around here. The Y10s and Y11s get progressively more disheveled as the months go by. Dd's blazer was a holey, paint-splattered relic by the end of Y11. Then on the final day of study leave, they sign each other's shirts. Mind you, shirt signing also happens at the end of first school in Y4 and middle school in Y8. As I generally buy all the school uniform for pennies from the second hand shop or get hand-me-downs from friends, just one shirt being signed doesn't seem too dreadful to me these days. But I admit I didn't feel like that when dd first 'wasted' a 50p school shirt by getting it signed in Y4.
I had my observation lesson yesterday and got a 'very good'. I had a lot of very positive feedback from the tutor, who wants me to apply for doing the next level course. I am, of course, very pleased about the positive feedback, but keep wondering when they are all going to notice that I am, in fact, crap.
Doing the next level course is not possible as I can't afford to and, even if I could afford it, I am not sure that I could hack the commute again, but I am pleased that she thinks I have the ability. It is v cheering.
I have a load of hideous work to do by Fri evening for my version of CDiff. It is not going hugely well so far.
BTM, good luck to dd for the rest of her exams and hooray for the arrival of snow chains. Hope you will feel refreshed and about 60 years younger after your skiing hol. 
Herbs, good luck for the observation lesson. I think I sweated about as much during my observed lesson as I do during a circuits class. Am now wondering what on earth I can wear in the summer term to camouflage my anxiety sweats.