Ear popping - try the TMJ topics just to see if those people's symptoms sound familiar.
You may be suffering from more than one condition which happen to have similar symptoms. I've had allergies, sinus problems and migraines for years. Although each has its own cycle, occasionally they overlap and obscure the clinical picture.
It's possible to have migraine without facial pain. Suggest you read articles on migraine on both MedLinePlus and emedicine. As you probably know, migraines are vascular headaches that also elicit a very strong inflamatory response. Migraine therefore can account for a good portion of your symptoms.
The people I personally know that have migraine tend to have low or low-normal blood pressure, are very sensitive to nitrates in foods [usu. deli-type meats esp. hot dogs], tannins and MSG. Many are also exceptionally sensitive to barometric changes; a somewhat smaller proportion have orthostatic hypotension, hyperacuity/tinnitis and/or vertigo.