I switched to a new school and left behind 10 good friends. At my new school I have 3 ok friends. I feel weak, tired, and sad all the time I get random stomach ahcs and yearn to cry for no reason. I'm not happy when I should be like around friends I have to fake a smile all the time so people don't freak. I dont show people I'm sad because I don't want to bother them. My gut always feels hollow or nausses. What's wrong?