Scar,

One thing about lucid dreaming is that the better you are at being right here in the present, the better you are at becoming lucid in your dream. Also, your lucidity will only last about as long as you are able to remain firmly in the present once you become lucid. When you start to drift out of the here-and-now, it is easy to forget that it is a dream and you end up non-lucid.

Although it may be possible to relive the past in your lucid dreams, it is an extremely advanced thing to do. Ironically, I think you will find that before you can gain the ability to relive the past in your lucid dreams, you will need to no longer feel a pressing need to relive your past. It may not make sense to you right now, but it will.

How much of the day do you spend with your mind in the present (the mental state necessary to recognize whether you are dreaming or not)? Work on that.