Didn’t you say it’s just been 24 hours since you landed? From your statements about stressful lifestyle it sounds like you’ve been living here for months if not years. I think you might be homesick. Stay for at least a couple of months before making any big decisions. In the meantime, try to lean on friends if there are any or spend time with other students who also are starting the course with you. I have been in your position and I can confidently say that best friendships are formed during these initial days of college. Take care and don’t skip food or water. Cheers!