Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that sinus pressure and fatigue is most probably due to infection and inflammation in the sinuses leading to
Sinusitis..
As it does not seem to be getting better with antibiotics I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like PNS view x ray or MRI scan can help in diagnosis and treatment can be done accordingly..
You can be advised a course of higher antibiotics like Augmentin, anti-inflammatory painkiller like Ibuprofen, decongestants like Pseudoephadrine, do saline
nasal irrigation, steam inhalation and use a humidifier in your room..
You can also be advised decongestant nasal sprays containing
Xylometazoline or
Oxymetazoline..
Do saline nasal irrigations..
In case if it still does not show signs of improvement you can be advised Endoscopic
Sinus Surgery for relief..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.