When I was doing C25K, I read around on a lot of threads and different forums on people's progress. I think it's fair to say that most people struggle with Week 6 - it's fairly common, so not just you and your own personal levels of motivation.
My biggest advice is to really slow down. Not just a bit, but make a significant decision to run slowly from the outset of the first section of running.
It is far, far more important that you finish and complete the run intervals in full, rather than how far you go on your run. Keep telling yourself "easy jog, this is supposed to be an easy jog not an exhausting run".
Even experienced runners tend you start slower pace. If you're feeling OK in the last 5 mins of your run, then up your pace a tad. But if you're not feeling it, keep your pace slow. That's OK too. The most important thing is you finish all the timed sessions in full.
Trust the program too. Follow it through. I listen to the podcasts (on nhs website), so they have music as well as motivation. It helped me to keep going.
After this week you'll be running without a break every run. So it will be the same kind of run before and after your holiday. Personally, I probably wouldn't run on a weeks holiday (I might on a 2 week holiday tho). But I would expect to need to significantly slow my pace down upon return. Take about a week to build back up to as fast as you were, but keep doing the runs.