My Symptoms Are: Nausea, Chills, Tired, Swollen Neck Gland, Hungry

My symptoms are:
nausea, chills, tired, swollen neck gland, hungry but I can't eat due to nausea, low grade fever at times. I had a really bad cold about a month ago. I went to the Dr. and they have me a Z pack although they weren't convinced I needed it. They gave it to me because I was leaving to travel outside of the country. I recovered from that sickness and now I've been suffering the above symptoms for a week now. No improvement. Slowly getting worse. I don't have a cough or sore throat or runny nose. I suffer from seasonal allergies, so I have been dealing with that somewhat.