Have had a headache and indigestion for a week straight now what could be the cause?

Many things: The indigestions could be caused by taking over the counter pain medications to treat the headache. However, both conditions are very broad symptoms which could be caused by a number of things. The best way to find out is to get to your doctor for an evaluation.

Viral syndrome: This is probably a cold or flu-like illness. Perhaps fatigue, stress, worry, or poor sleep. Monitor, and if continues, call your doctor.