Tricky one- I'm assuming your new job is in a new school? I'd be tempted to take (and self cert) a few days off. A stomach bug perhaps? Do you think that would give you enough time to be rested? If you are going to another school I expect your current school are giving you loads of jobs to do to get their money's worth? If you do think this is the case then stuff em! If you are struggling, them piling on the work won't help. If you don't feel like you can take time off then just take each week/day/lesson as it comes....it's only a few weeks til the summer holidays. Hope all goes well.