If you're not working you can find yourself dwelling on things. If you had somewhere to go tomorrow by a certain time then you would be planning what you're wearing tomorrow, etc & wouldn't have time to dwell on things like this.
Is there something you can get busy with to fill up your days? Even exercise or charity work & you could use the charity work as a reference to help you get a job.
Did you lose some elderly relatives recently or are some not well?
You do need to apply some logic here, I mean probably alot of people worry about getting cancer but what can you do? You can only eat well & look after yourself, it's just life? Why worry about things that haven't happened? How about using some of your spare time to read some logical self help books that can get you looking at things differently? Go to your library self help section & find some, like Dr Phil or something. Read the Power of Now by Eckhart Tolle, it's all about concentrating on each moment, not thinking about the past of future. By focusing on now, on what's in front of you this very second, it's impossible to worry about getting old or dying of cancer. Do you get it? Try it? But maybe you are a a bit addicted to your emotions & are actually getting something out of the drama of worrying? I guess that makes sense if you have not got much going on in your life, like no job, etc. I also know that rigorous exercise where you get your heart rate up for 20 minutes or more will stop your mind from racing around like it is.
I think you need to get real with yourself. You are in control of your mind so you can stop it from worrying about these silly things. Just try that concentrating on the what's before your eyes right now thing, if you do that, it's impossible to worry about anything.