I don't know anything about past lives, but I found this in an online dream "dictionary" -
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Fire

Depending on the context of your dream, to see fire in your dream can symbolizes destruction, passion, desire, illumination, transformation, enlightenment, or anger. It may suggest that something old is passing and something new is entering your life. Your thoughts and views are changing. In particular, if the fire is under control or contained in one area, it is a metaphor of your own internal fire and inner transformation. It also represents your drive and motivation.

To dream of that you are being burned by fire, indicates that your temper is getting out of control. Some issue or situation is burning you up inside.

To dream that a house is on fire, signifies passion and loving companions.

To dream that you put out a fire, signifies that you will overcome your obstacles in your life through much work and effort.
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SOme of my memorable dreams involved entering a room to find that it was actually underwater, and swimming through it trying to find some sort of path - back to the dream dictionary in a moment to find out what that might mean...

I've tried that before, where you just tell yourself before going to sleep that you'll remember your dreams, but it's never worked in the past. I might have to try self-hypnosis, and then give myself the suggestion that I'll remember my dreams when I wake up - sort of the same thing as just telling yourself something, but with a little more hocus-pocus - Suzanne