Sick with severe congestion for three days. Had a temp up until tuesday but no longer have it. Still achy have a cough. Decongestants don't work?

Viral..... This is likely a viral infection(perhaps flu) that will run its course over the next few days. For cough and chest congestion, see your doctor (since over the counter meds not working) as you may need bronchodilator and perhaps steroid inhalers to decrease bronchospasm that may be causing the cough. For nasal congestion, perhaps saline nasal spray (over the counter); see doctor if ineffective.