Hi,
What do you do when you take a 5 minute break to come back to those textbooks feeling refreshed?

Whatever it takes! Sometimes I used to break up my tasks and allocate each one a reward. I suggest stuff like: get a Paddle Pop, look at wedding photos, cup of coffee, phone Mum, go for a walk, 15 minutes of internet time etc. Some of them may not sound all that "rewarding" but it gives you something to work towards, and cuts down on the procrastinating!

Good luck! Med Sci is hard going!