Glad to hear you are feeling a little better every day.
Dehydration (if this was indeed the correct diagnosis that was made), can have many, many causes. Dehydration itself is defined as a lose of fluids (water) and electrolytes (sodium and potassium) from the body. Even very mild dehydration can cause dizziness and a few other symptoms. Would like to also say that sometimes Dr's will treat you for dehydration just in case mild dehydration is occuring just to cover all bases. In normal, healthy people, the extra fluids will not hurt you.
Another possibility is a problem with the inner ear. The inner ear is responsible for balance. If something is going on (albeit small) with the inner ear, it can make you feel very dizzy. This is what the other expert was explaining. There are also several causes for a condition called labyrinthitis (inflammation of the inner ear structure), and it generally goes away on it's own.
Taking too much aspirin can also cause dizziness and so can other medications.
If you are not fully over your dizziness in a few more days, you will need to return to see your Dr and have them possibly have them put you on a heart monitor that you wear home to see if you may be having some irregular heartbeats as well (that you are unaware of). Once, the heart monitor is worn (usually for 24 hours) and there is nothing found, then you might be diagnosed with something called Benign paroxysmal positional vertigo. You can read more about it here.
So, I would look at this problem as something simple and hopes that it goes away on it's own as fast as it came on and never returns. But if it doesn't then you will need to return to the Dr.
Hope this helps, reply if needed.
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Edited by Nurse Milli on 10/2/2009 at 6:23 PM EST