Chronic pressure/tightness in face and back of head on the left side

[Piaka]

Since the last two years I have had a persistent pressure/tightness-like sensation in in my forehead (near eyebrow), cheek, the bridge of the nose and the back of the the head at the top. All of this is on the left side and it rately radiates to the other side. Occasionally the pressure/tightness is accompanied by a dull, pulsating ache in the aforementioned areas. Pressing the point where the bridge of the nose and forehead meet gives some relief. Lying down on my back with the back of my head firmly pressed against a pillow also gives relief, but once I rise the pressure/tightness is back again after some time. I have been on decongestants, analgesics, gabapentin, livocetrizine and fluticasone furoate nasal spray in the course of these two years, but none of them has proved effective.

On the recommendation of an ENT specialist I recently got a PNS CT-scan done. It shows mildly deviated nasal septum towards the left and two small polyps arising from the floor of the left maxillary sinus. I was almost convinced  that this is the diagnosis and that I would be treated accordingly so that I can get rid of this ordeal that I have been going through for such a long time as soon as possible. However, the doctor said these conditions are not causing the condition I described above, shattering all my hopes.

So now I'm totally clueless as to what could be causing this. Does anyone else had or has the same condition? If yes, did you receive any diagnosis?

[blooki]

Do you spend a lot of time at a desk, using a computer or reading.
Most people who do (Myself included) tend to lean to one side more than the other, causing muscular skeletal stress, and pain.
The pain may also be worsened in the head, neck, and jaw area if you tend to put your elbows on the desk and lean your head down into your palm (Or palms) for extended periods of time.  
If any of this (Trivial as it may sound) describes your body positioning for a few hours at a time during the day, it may be the source of your problem.
Try being more conscious of you posture, and/or raising the height of your work area (Desk) to avoid leaning down into it.  

[DSH519]

I have had similar symptoms in the past. Have your doctor refer you to a neurologist for a thorough check of your head and neck

[Piaka]

I forgot to mention that at times I have this slight discomfort in my lower jaw and chin during the pressure/tightness episodes.