Whilst I agree that it is wise to go back to the doctors or a second opinion. I suggest having some test done, just to make sure...As others have said, your blood pressure, blood tests and may be a MR scan, see what the doc says....
Once these possible causes of general dizziness have been checked, resolved or eliminated.
If then, you are still getting these dizzy spells..... It is time to hone your skills and work on some really good grounding exercise. (Stand like a tree), be as a willow, steadfast, grounded, yet as flexible as the breeze.
Chi kung, thai chi, Kundalini yoga, hug a tree, meditation with your back against the roots and trunk of a tree like an oak, balancing chakra work, breathing work.... All of which I have mentioned many times over to all who are working like a wind sock.....

To be honest,
I am getting a tad fed up repeating myself to so many of the threads in here, about these basic good practises.
Grounding is a priority, a must, a prerequisite of any work of this nature.
Whilst I wish to help,
I am agog

at just how little people seem to know of the basics.
For example,
The reason why you are/where able to see others auras most easily during wrestling is because there are many levels to anyone aura, such as bone, blood, nerve, instinct....and a whole host besides. The levels you where most likely seeing where the blood and instinct levels, as these are most active/charged during such activities as wrestling.
Hope this helps,
Please, do explore how best to ground yourself.