Weird bodily changes. Please help!

My exams started on 9th March (board exams). A month before that I used to feel really hungry. I used a binge eat many times a day. I even gained weight and started feeling low about my body image. It was 2 weeks before the exam when I actually witnessed that my sleeping patterns have changed. I sleep all day long and wake up all night. I often feel helpless and start crying in the middle of the night thinking that I have no one to talk to. I have observed changes in the menstrual cycle (missing periods). When I am sleeping all day long, I cannot hear the sounds of any bell or alarm. I have very few friends with whom I can talk to about all this. My parents also don't understand me. I feel lonely most of the time. I am not allowed to go much outside, so I remain in my room all day long. I have a very bad habit of procrastination which is why I often end up feeling guilty while I am on social media, delaying my studying time. All this is makes me really uncomfortable. Please help!