OK. You have already made the important first step of admitting there is a problem. The first thing you can do on your own to make yourself feel better is to work on your sleep. Human beings, especially adolescent human beings, are not wired to function on only five or so hours a night. You really need more like 8. Read up on how to turn your sleep around. Set up a schedule. Make sure to get all stressful things done and out of the way long before bedtime. Don’t drink coffee or caffeinated soda after lunch. Get some exercise in every day. Give it an honest try for at least a week. If it doesn’t iimprove at all, that it could be that the sleeplessness is a symptom of depression. But my first guess is that it’s a bad habit. Let’s at least start there.
Next, have a serious talk with yourself about whether you really want and need to do AP work in all your classes. Are they required for your eventual goals or have you gotten caught up in something that really isn’t necessary? I know this is heretical talk in some circles but it isn’t necessary to have straight As and all AP courses to get into many very good colleges. Admissions officers are looking for people who do other things besides studying all the time. Have a clear discussion with your guidance counselor about how to reduce your stress.
Still feeling terrible? Get a checkup if you haven’t already. There are many medical problems that show up with the same symptoms as depression. You may have a vitamin deficiency, for example.
Still no good? Sigh. Now you have to rethink your position about not telling anyone. Ask your doctor if she or he has a suggestion for someone to talk to who has experience working with teens and their families. In the meantime, you can try using the Boys and Girls Town hotlline as a place where you can remain anonymous but still get some support and practical help with your problems. Their number is 800-448-3000.
I wish you well.