okay so my recurring symptoms are in my profile. however, something new happened last night. i was getting the usual spell of dizziness(unsteady appearing room, slight loss of balance, visually it appeared as if i was looking at things while my head was floating on water) and alongside of it i was getting pressure in my head that seemed to be coming from way behind my face, where i imagine the sphenoid sinus is, and pressure that seemed to be pushing up against my ears from the inside. remember, i also have crackling noises when i swallow and yawn too(eustachian tube dysfunction)... well in addition to the pressure and dizziness, i got sudden head rushes at uneven intervals every few minutes, and it sorta felt like the blood was rushing into my deep sinuses. of course, anxiety hit me because i immediately thought of those people that suddenly die of a heart attack when the only symptom/warning they had was a head rush. i thought long and hard about going to the ER but i am uninsured and a huge debt seemed like icing on the cake. anyway i eventually fell asleep after a lot of anxiety(i was nervous and my heart was beating fast). this morning i woke up to a couple more head rushes but they went away and now im back to the usual equilibrium problems, constant head pressure, and occassional severe bout of dizziness. i never felt like i was passing out, it was just an overwhelming sensation..........last year i was diagnosed with allergic rhinitis and postnasal drip, it that helps anything. i would like an answer. can sinus allergies cause dizziness, and sudden head rushes???? just knowing how would help ease my mind.