Why do I feel like my cold/flu won't go away?

Ok, I got sick Friday night at 9:30pm May 20th with just a sore throat, and a cough from it. Saturday morning I woke up with a full blown runny nose,cough, extremely sore throat,nausea, body aches, feel like im dying etc. But I had NO FEVER at all during this course. I noticed my sore throat went away, Monday May 23rd, and I felt like I was getting better Tuesday. But today Wednesday May 25th, I feel like my throat is sore again, and I am coughing like crazy, and even though my nose dried up a little I feel like it's running a little more today. My question is why did my sore throat come back, when I felt like I was getting better? Does this sound like a flu or a cold to you? Also I am coughing up some mucus, and I just feel like my throat is sore and scratchy, and it aggravates me cause I thought I was getting better. Please answer, tell what you think. Also I have been drowning myself in Vitamins,Water,Orange Juice, and I still don't really feel any better, I just feel a little bit better.