Can a sinus infection get worse without treatment? I thought mine went away but now I have really bad headaches still that wont go away.

Sinus headache. Yes, untreated sinusitis can worsen and cause serious medical risks, especially if the sinus involved is the sphenoid sinus (deeper in the skull). Although what most people call sinus headache is actually a migraine, if you have headaches associated with prominent nasal congestion or heavy think nasal discharges you should see your doctor for treatment. Hope you feel well soon, .