Hi!
This sounds more like chronic sinusitis. Chronic sinusitis is often allergic and can be due to mold infection too. A damp wall in the house, carpets, and ACs are all potential sources of mold. Please consult an allergy specialist. You may need to take the allergy test. Chronic sinusitis can also be due to EBV infection. The other possibility is deviated nasal septum. Nasal polyps and tumors, worms in stool causing high eosinophil counts, gastric reflux are the other causes. The treatment will be complete only on removing the cause. Hence please consult an ENT specialist (you must already be under one) and discuss these possibilities. Depending on the cause treatment will be prescribed. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
I think it sounds stress related. A stress related tension headache seems reasonable.
M