Bit of an odd thing to confess, but what the hell.
Most people get deja vu, right? How it feels is different for everyone I would guess, but mine just gets to me sometimes. Occasionaly it's like when it actually happens, it feels like can actually say 'Wait a minute, why do I remember doing this 3 months ago?' or give an actual time. I don't know if that's how it's meant to work with some people, but it sounds unusual enough to me.
What feel worse though is something I call 'double deja vu' when while the event that I remember is happening, not only does it feel like I've done it before, I 'remember' having the exact same feeling of deja vu the 'original' time the event happened. Sometimes it almost feels like it sets off a recursion in my head that's disorientating to say the least.
One last feeling with it is when the event that I get deja vu with last more than say 5-10 seconds, every action I take feels...painful, in that try to dog anything other than what I 'remember' having happened feels uncomfortable.
I may be completely wrong in thinking this is unusual, but I'm the only one I know out of the few people I've talked to about this that has experienced something similar.