Scarlet, I don't know if you're financially able to do this or not, but instead of guessing, or having other people guessing based on one simple symptom, why don't you consider a consultation with a naturopath, a nutrition consultant, or some holistic practitioner, so you can get to the bottom of this? I agree that the questionnaires provide a good starting point, but even with those, you may end up confused. Case in point, if you do both an adrenal and a thyroid questionnaire, you'll come up with lots of overlap. Adrenal and thyroid symptoms are very similar, and when one has a thyroid issue, you can bet the adrenals are involved, too. The trick is to ascertain which one is most "up", so nutrition and other protocols can be prioritized. This is the quickest way out of the fatigue. If you're in the Bay Area, maybe Bauman Nutrition has special student rates, or maybe you can offer cooking services in trade (I really don't know if they'll go for this).
If finances are a huge issue, then answering as many in-depth questionnaires as you can will help you in your work to narrow down what's going on. What these can't do is provide you with specific information regarding the workings of your body.
The dietary suggestions you've received here may prove very helpful. With my clients, I find the adequate morning protein suggestion to be the most helpful, as it helps carry them through into the afternoon with higher energy. So, whatever you do, please keep us posted and let us know what works.