Dry rough cough fits when take deep breaths, chest pain, shortness of breath, body aches, fatigue, sore throat, sneezing, headache, nausea. ideas?

Flu like illness: It sounds like you have a respiratory infection- whether that's the flu or any one of other germs remains in question. If you see a doctor, they can perform diagnostic tests to help figure out what you have (cultures, blood work, chest X-rays etc). You may have 'reactive airways' - something like asthma that could trigger the paroxysms of cough you describe. Hope you can schedule an apt with doc.