You don’t get to pick how long you have. You get to pick what you do with it.

A large part of your situation was never open to negotiation, including the length of it. Energy spent on the fixed part produces nothing except anxiety, while the open part, which is what fills the time, stays available every single day. Separating the two is most of what peace of mind consists of.

Name one thing you have been worrying about that you cannot influence at all. Set it down, at least for today, and pick something from the other category instead. Then go and do that thing rather than thinking about it.