Dizzy while standing

I have been reading your posts and want to see if anyone can help me

4 weeks ago I came down with an ear infection ran two doses of antibiotics for three weeks and the doc says it cleared up.  I am still feeling stuffy everyday and have been dizzy only when standing,  I work at a large store and have to move around a ton.  I dread when I have to walk across the store because I need to take a sit down brake because I feel dizzy.  I am the one moving around and feel like I am always going to the right side when I walk.  After I sit down it clears up and I am fine.  I went to see an ear nose and throat specialist and after numerous checks the doc says I am 100% fine.  I am 46 years old with high cholestral watching my diet so I don't have to go on pills.

When I sleep I am perfect, today when I woke up 5 minutes later I am dizzy walking around my house.

Any ideas?

Thanks