The most common complaint among college students is fatigue. Listen to what your body is telling you. You don't need medical attention unless you are sleeping 12 hours a night and still can't get up to go to class. Try to eat a well balanced diet. The resident hall cafeterias offer good food selections.
Fast food is OK once in a while, but is high in fat and calories.
Find out what the attendance policy is in all of your classes. If you are sick and can't go to class, call you instructor. Don't wait until the end of the semester to cover absences. Somce instructors require a medical excuse even though this is technically against University policy. The Health Center does not give excuses for missed classes.