This sounds like a WILD attempt turned into non-lucid FA. It is quite common, but now that you have experienced it, chances are that you will recognize it next time and become lucid. A lot of my WILD attempts fail but turn into a NLD, and quite often I will recognize that I am dreaming, probably because I had lucid dreaming on my mind just a couple of minutes ago.
(I called this WILD rather than DEILD because of the time elapsed, but it's essentially the same thing, so next time you try a DEILD, know that it may well turn into a DILD or FA.)
As for staying lucid, there are many good techniques that people use. For DEILD, I like to simply count: "1 I'm dreaming, 2 I'm dreaming, 3 I'm dreaming..." If it works, I'll be in a dream by the time I reach 10. If not, I may try for a WILD. You can read more about how to do that here:
Wake Initiated Lucid Dreams (WILD)
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