Sure, when things are going down, they can either get worse or get better. There is room for a lot of getting better, and an increasingly smaller amount of getting worse as you head towards death.
Then as things get better, there is a ceiling of that as well based on your current lifestyle, again, it is feasible that it can all go down at any minute.
You can either think about it and assume the worst and worry - or you can just ignore it and enjoy the ride of the ups and downs.
If it isn't as easy to turn that on and off, then there is always substance abuse, the cult/religion of your choice, or self inflicted death.
That right there is the essence of life.