My Daughter 22 Is Sick -fever, Swollen Lymph Gland, Fatigue,

My daughter 22 is sick -fever, swollen lymph gland, fatigue, dizzy, loss of apptitite, sore throat, can or sore, now has no fever but still feel sick and has blisters around mouth. Complaint her side hurts. Previously had mono when 14 and had pneumonia two years ago. Saw doctor who sent her home with cold sore medicine but she is feeling much worse today.