Hello Friend, Good that you are seeking a help here. As you expressed about anxiety and stress, they even influence body function through nervousness, numbness, sleeplessness, digestion problem etc and that's what you are experiencing.you need to look at this holistically for any remedies .  Exam fear may be one of the reason for this stress. It needs further evaluation to understand and assess your current suitation and explore the possible solutions options. You may need a guidance of counseling support to handle it better. You may reach me online for further evaluation.

Hi it's better u consult any psychiatrist personally and get ur evaluation done properly it will help you more than online things. It for ur own good and wellbeing . Tc Dr Ankit Patel Psychiatrist  Pune.