First of all, if have a graduation coming, you have achieved in life! Take a look at your life - I bet you'll find more achievements than you are giving yourself credit for....And achievement counts - even if you don't reach it by a deadline!
I just want the members of this community to be healthy and able to maintain great habits for life.
I don't think you are going to hear encouragement from anyone to continue with 500 calories a day...
With all of your research, I'm surprised that you are still on a quest for fast weight loss and eating only 500 calories a day. If you are really committed to a life long plan of healthy eating, exercise and weight maintenance, you need to rethink your strategy.
A direct quote from one of our experts: "When you eat too few calories you lose fat but also precious muscle, which is the worst thing you could do because it slows your metabolism and makes it more difficult to increase exercise intensity or duration".
Additionally: Weight loss experts agree that any rapid weight loss diet should be identical to a long-term, sustainable plan -- and not a fad diet. And fasting or cutting calories below 1,050-1,200 are not appropriate for the long term unless you are under a physician's care.