Hi I understand with your statement that, you are feeling anxious of something, related your personal or academic life. Due to this you may not be having proper intake of food as you have expressed there is feeling of insomnia, leading to physical problem. Please dont hestitate to visit psychiatrist or psychologist in your place, you need to be analysed and they will guide you in a better way.
Health Tips
try to share your feeling to whom you feel comfortable or with your family members.