I have a Dell XPS 13. Nice and lightweight, pretty speedy as well. I'm not sure about stats software, but I'm able to juggle different programs (NVivo, Word, Excel, browser with too many tabs) and listen to music at the same time pretty easily.

I was in a similar situation not that long ago. After my viva I was giving minor corrections, although the list was quite substantial. Not long after the viva was over I started feeling deflated - I looked over my list of corrections and they seemed to go on forever, and for some of them I had no idea how I was going to tackle the changes asked for. I remember vividly that knot in the stomach feeling and whenever anyone asked how it was going I just wanted to curl up in a ball and roll away from them. I also started getting a few "what you've still not completed them?" from some people a week after the viva. I don't have any great advice I'm afraid - just know that you're not alone, although it may feel like it, there are others out there who have went through the same thing. Don't feel defeated - if you have made it this far you can get through it. Stick it out, and hand in whatever changes you can manage. If you can, go back to your supervisor and ask for some advice and encouragement.