I agree, this is most likely sinus related.
The sinuses can become inflamed due to viruses or allergens- they react by producing more mucus which blocks the sinus openings. When the sinus openings are blocked, the sinus cavity lining becomes inflammed and in some cases you will actually see swelling. There is usually pressure/pain in the area of blockage. We have sinus cavities in our cheeks, under our eyes and in our foreheads.
The other important thing is that we need proper hydration, when the lining of the nose gets dry the sinuses will react by producing more mucus. We know that alcohol dehydrates- so I would suggest drinking one glass water for every one glass alcohol and limiting salt in your diet.
To help sinus swelling/inflammation, I would suggest irrigating with a saline rinse (you can purchase irrigation kits at your pharmacy or a netti-pot) you simply prepare the rinse as the kit directs and then insert into one nostril. It will rinse the sinuses and come out the other nostril, this may help to relieve a blocked sinus and it is very safe. Saline is natural- there is not medication.
The other treatment that may help is an intiinflammatory nasal spray- it is a very low dose of steroid (Flonase or Nasonex). You would have to see your Doctor for a prescription. If these things don't work, I'd suggest seeing an ENT specialist.
Best of luck- hope this was somewhat useful to you.