Things getting better.... only to inevitably get worse?

I've been feeling better recently. I've been making a dent in a few plans that I've been trying to implement, moved my office and have more space, and started step one of getting the house ready for possibly moving. The problem is, things go well for a while, but I'm so damn unstable that something so dumb will happen and I'll fly off the handle. And I suppose it's because I've been storing all my ammunition because none of the bad feelings have never really gone away. How do I let go of something that is completely unresolved? As I am not hoping for that thing, that one insanely stupid wrong thing, to happen, I am trying not to get too comfortable here.