I thought it was allergies but my sister is sick.?

my 6 year old sister has been coughing hard for about 4 days, and she is stopped up. her eyes are dry and red and swollen. she has bad allergies so this wasn't very abnormal. but today she woke up with all her symptoms listed before much worse, she has a 102 fever, no appetite, and threw up once. she is also achy, and i am worried about her. (i am her legal guardian, we dont have parents.) she has a regularly scheduled doctors appointment in 3 days, and we cant go earlier. what do you think it is? over counter medicines? just give me any advice you can, that would be great. thank you!