Thanks for your advice and interest. I should give you some background about this first:
I only have it in my left ear. I got mine several decades ago when a careless colleague fired a rifle close to my ear and I wasn't wearing ear protection.
I have seen several ENT Specialists (Or consultants as they are known in the UK), and had my ears syringed 3 times.
The quality of my hearing did not change (after they had dried out ofcourse), and I have never had any dificulty in performing the Valsalva test, infact ear clearing/equalisation has never been a problem. My Eustachean tubes are like well used condoms, my naso pharynx is like the 'Channel tunnels - Dover to Calais return, and diving does not affect my hearing.
I do not suffer from vertigo, nausea, disorientation or any of the other symptoms you mentioned.
I do not use Asprin at all and if I ever get a headache which is very rare I have only used Ibrobrufen.
I have one coffee a day usually in the morning but it is decaffinated.
I can't comment on Ginko as I don't know what it is!
I have even tried laying off diving for almost 6 months to see if it was having any effect on the quality of my hearing in my left ear, which is the only ear effected by this.
That's about as much information as you have requested but please let me know if you need to know more.
Aquamore
(AKA Allan)