Ive had EXCACTLY this same problem.
Started in december with mild post nasal drip, then i had a chronic cough, throat infection, chest infection which turned into a 3 month nigtmnare with a sinus issue...i had they typical thick yellow and clear stuff which i was constantly blowing out of my nose and coughing up. I had headaches tingling and constantly felt off balance and dizzy.
My ears were blocked at one point for around 4 weeks and i couldnt hear anything....i went to the doctors on the 3rd week and said i had had enough. I had already been on 3 doses of antibiotics during the above.
He thought it may be an allergy problem which was causing the sinus issues. He gave me Beconase nasal spray...but i switched to oral antihistamines becuase of nose blockage.
Anyhow, about 2 weeks ago out of nowhere the nasal problem suddenly cleared....its not 100% but no where near as bad. My ears have cleared.
Since then i have had major facial tingling where sunglasses would sit, also i have moments where sitting down my body feels like its moving or like ive stepped off a fairground ride, same when walking. I went back to the doctors Tuesday and he said that the tingling is prob a sign of it getting better...The dizziness maybe a temporary type of labrythitis which can follow a virus etc etc. He told me to live it out.......
Also i get those silver sprinkles...Thought it maybe my blood pressure....???
If the spray doesnt work maybe try the pill version...the dizziness is getting a little better...i think my heads trying to adjust to the sudden change of pressure etc etc....