Obsessive thoughts

Hi, I am a 20 yr old student from India. For the entire past year I have recurrent thoughts everyday that I would not be able to sleep the night before my exams and will fail because of it. I try and get rid of the thought but it is refusing to go away. I don't indulge in rituals like cleaning room, or mentally counting etc which are classic symptoms of OCD, but at the same time I keep having this thought. I have seen counsellors who think I am lazy and simply don't want to study but it is not the case, the thought keeps coming back. I have been prescribed BUSPIN-.5 for stress. It is not helping me. I have become depressed because of it and don't worry about my parents etc I just keep thinking about myself and this thought. I don't know what to do please help me. Last year I didnt sleep before my papers just thinking about this thought, I did not do badly but this year this thought pre-dominates my head. It is affecting everything in my life. My counsellors thought I was lonely so I started talking to more people but I just am distracted while doing so but the thought comes back again. Please help me, please tell me what is wrong with me