I am suffering from the exact same thing,have had the dizzy/woozy feeling since giving birth to my second baby in july last year!
At first I thought it was down to being tired,obviosly not as I still have it!
Im currently taking propaol for my palpataions,and panic attacks,and thought that could be causing this dizziness.
I have had loads of tests too,and nothing is worng?
I am due to see a ear specialist next month,just to complelty rule out any inner ear problems.
Im sure its down to anxiety,and just hope it goes away soon!
The best thing is just try and keep yourself busy,and try not to let it bog you down too much,it tends to get worse when you give in to it!!!!
Take care
x