If I drink a certain kind of energy drink, the formula was recently changed and isn't available in its proper form in Canada anymore, I will not sleep and find myself quite excited.

I have no idea how much an ounce is but, a cup of coffee (250 ml) has between 90 and 120 mg of caffiene. You may need to double check your sources there.

15 cups is ridiculous and would keep you up even hours after drinking it. Would also cause plenty of nausea and mood changes.

Diagnosis is a waste of life unless you want to take the medication and concern yourself with your ups and downs worrying that you're going crazy when you're really very happy or experiencing something that would have been meaningful otherwise. When you're diagnosed, inspiration is disease. Insight is psychosis.