Hi Cin!

Since you're developing a cough with this, it could very well be a case of Mycoplasma (walking pneumonia). My daughter has had this twice in the last year and it's very easy to tell for the doctor just by listening to you breath with a stethescope. You don't always feel bad or even always run a fever, but you have chest tightness, shortness of breath and a hacky cough. It's not as dangerous as the streptococcal kind of pneumonia, but the sooner your get on antibiotics, sooner you'll feel better.
Keep us posted on how you're doing!