I love those déjà vu moments, I haven't had one now for quite a long time.
As Flame says, we need more details, was it a place/scene déjà vu or a conversational one? Don't worry, lol, you are not going mad.
Do you know what causes déjà vu? The most common theory is a time lapse between information entering the brain and the brain then issuing a conscious perception of that information.
I've always found it really interesting, esp when the instances are prolonged experiences, I once had it where it involved a new place I went to and the conversation taking place at the time, it seemed to last for ages and was soo wierd, lol, I tried to voice it as it was happening but it was like my my body was paralysed and I couldn't get the words out.
Strange, but good strange.
