I’m concerned. I’m not at all sure this is a mental health problem. Being so over-tired and having a backache suggest that there may be something medical going on. Please stop calling yourself lazy. It doesn’t help and it may be preventing you from going to see a doctor.
Seeing a doctor is exactly what I’m going to suggest that you do. With such serious symptoms, you need to make sure that the problem isn’t medical. I don’t know what “AD” is but if it was prescribed for you, it is your doctor who should be explaining to your parents why it is necessary.
It’s also possible that you need a break from academics. Achieving at a high level is stressful and exhausting. When a student loses interest, it is sometimes because they aren’t working toward a goal that makes sense to them. They have lost sight of why they are working so hard. Maybe you need to talk to someone about what your life goals are and whether your academics are relevant to those goals.
You made an important first step by writing to us here at PsychCentral. The next step is to make an appointment with your doctor. Please follow through. You deserve to feel better.
I wish you well.