I have the same thing
started in my 20's really, I was in Uni and felt an odd feeling of Deja Vu, really odd though as though this world wasnt 'correct' and though we were all doing it wrong and there was an alternate reality that we should all be able to see.
I then felt really sick/nausea and passed out, woke up on the floor surrounded by students and a VERY worried lecturer with some med staff.
Started work at a local hospital and again in induction had the same feeling during our infection control training. once again Deja vu and feeling as though this world wasnt right, and that we should be able to understand that we were wrong.
doink!! - again passed out and woke up in A&E with my new boss looking worried.
Luckily that was the very last time I passed out but I still get quite regular Deja Vu/dizzy/sick moments - I would say 2 a week though I can control them very well now - I usually look at my friend and say ' here is one of those things again' then I go all 'far away' for a moment or so then feel a bit sick.
I can even drive whilst in this state and brake for lights and everything so functionality is not really impaired though the feeling that this world is wrong weighs on me heavilly during these episodes.
Its almost as though we are living a dream and this is not correct - very hard to explain..
I also suffer from a lot of memory loss these days , short term and mid range at least - I can recall 20 years ago like yesterday.
I know it may sound loopy but I find that white noise helps me a lot so I sit in server rooms a lot of the time and one other weird thing I found was that when I went to see Alice in Wonderland - the tim burton one, I thought that it seemed more 'correct' than this world so much so that my arm hair stood on end for ages on several occasions and I felt like a nutjob. even typing this and thinking about it has set it off.
very very odd