Balance disorder - what does this sound like?

[Derek897]

31 year old male with no other health problems and no history of ear problems.

12 October – sudden onset of dizzy symptoms. As far as I recall, the symptoms were there when I awoke; I attributed them to having had a late night and being a bit tired. (An aside: Later that week, two large whitehead spots developed, one after the other, on either side of the edge of my lower lip. Strange that they were almost symmetrical in position. The spots disappeared very quickly. I’m not prone to spots, so I thought I might have picked up a virus.)

2 November – visited doctor, who conducted various tests: blood pressure, heart rate, reflex test, checked eyes and in ears. Nothing found from tests – everything normal. No discharge from ears. Doctor said it is not something serious, but would like me to have a blood test.

9 November – will have a blood test.

Symptoms are:

Movement lag - head movements sensations lagging behind actual movements made. Most noticeable when getting up from a seated position and moving about. Not episodic, constant. Unsteadiness when walking but well within control (can walk perfectly normally but it feels like I’m trying harder to maintain balance and a straight path).

Concentration/memory - short term memory is worse than normal, almost as if events are not even written to short term memory.

Slight difficulty tracking text on computer screens. My eyesight is usually very good (I don’t need glasses).
Breathing in hard through nostrils allows me to reproduce symptoms, feels like pressure systems are being disturbed.

Any ideas?