Chest Pain (toleratable ache) in left side, radiating to left arm and middle finger, I am 20 y/o?

Stress can cause symptoms like this but at the same time this could be very serious. Even though you're only 20, you could still be suffering from heart problems. If it starts getting worse I would recommend waking up your parents and having them take you to the E.R. A myocardial infarction is very serious so trust your intuition and evaluate your symptoms. Don't put your parents first if you think you're in trouble.