Symptoms i have are lower back aches, indegestion and a bad cough. could it jsut be the flu?

Depends: If you are a teenager or young adult, these symptoms are less of a concern than if you are older and have other medical conditions. These sorts of symptoms require an examination by your physician to sort out if they last too long.

Flu symptoms: This certainly could be an answer to your symptoms, but with the indigestion the physician has to keep an open mind for other possibilities.