It wasn’t confusing at all. Thanks for writing in with your concerns. To answer your question, there may not be a good way to “control” your problem but you can get treatment for the problems you describe.
It sounds like you are beginning to experience symptoms of anxiety and depression, which go hand in hand many times. Specifically, it sounds like you might be suffering from obsessive-compulsive disorder, but the only way to truly know is to be evaluated by a mental health professional.
Please speak to your parents and your school counselor about getting some help. These problems you are having are real and there are very effective treatments available that could include therapy, medication or both. Feel free to print out your question and my answer if you think it might help you explain what you have been experiencing. Chances are that you will be able to bring your grades back up and begin enjoying life again once you get help.
All the best,
Dr. Holly Counts