gelert peaked my interest as i was making a jucie so i came to check out the post... (and Gelert you missed a "0" - its 5k
and I am now aiming for 6k by Dec
Anyway yeah I think your diet sounds low in protein - think lentils, chickpeas, brown rice and QUINOA for protein and carbs all whole-foods and gretat GI and nutritionally....
Dont be afraid to eat a lot more than you used to because vegans often tend to have much higher food intake maybe due to the fact it is a much lower fat diet
What fats do you get? Nuts? Seeds?Avocadoes? Do you cook with oils? Are you aware of the essential fatty acids?
Finally - exercise does help make you nmore energyful.
And starting at uni certainly is a tiring experience at first so let yourself get used to it before getting too worried.