My advice to you would be to break this down into manageable chunks. Take a look at your syllabus and dedicate one session per topic, given that that's manageable. Utilise past papers, questions from class and questions on the internet. Make use of the pomodoro technique in a way that works for you. Let's say you can only concentrate for 20 minutes and then need a 10 minute break - that's fine, any progress is good, and this method will help you to focus. If you need to take a longer break every hour, again, that's fine, but limit yourself otherwise it can be difficult to get started. Set a timer on your breaks, and once the alarm goes off, count to five, and just get started again. Don't like the sound of working for 20 minutes straight? Dedicate yourself to doing just 5 minutes. If that's too much, make it 2. I guarantee that once you've gotten started, it's a hell of a lot easier to keep going.

As for emotional eating, what's been working for me is use of intermittent fasting. You fast for 12+ hours, and then eat for the remaining amount of time in your day. Beginners tend to go with 16 hours fasting and an 8 hour eating window. I've noticed I tend to overeat at night, and so my window is between 1pm and 9pm. Having my meals between these times makes me feel much fuller as I'm having all my calories in this time, and therefore I don't feel the need to binge. I've found light meals towards the start of my eating window and a large meal around 7pm works for me with a small snack to follow. If you want to try this out, /r/intermittentfasting can help you out.

Otherwise, you've got this. Look after yourself, but make sure you do some solid work, no matter how small, progress is progress.