That does happen - the whole bit of predetermined fate seems to seep in once in a while during depressive cycles.

Perhaps the most important thing to realize is that nothing in this life will last: Buddhism teaches that this is a fleeting world of imperminence. Realising and applying this philosophy is very difficult and often times impossible.

Making the best of the moments we have in circumstances beyond our control - that's something I have to learn to apply more oft. For instance, if tomorrow I were walking outside and a truck smote me, or tonight.. a flaming meteorite flies into my home. These are circumstances well beyond normal people's controls. All we can do is to try and live through them - and hopefully growing as a person while doing just that.