How to not give a damn about the things that worry us?

I generally am a control freak and sometimes I find myself in a worrying situation as it cannot be controlled. This thing haunts me until there is a solution. As might be expected I need to wait until the solution comes its own way. In the meantime I make myself miserable. Because of that I cannot make the most of the day or throughout the day. I know that I need to change this immediately. Actually tried it. I failed each of the time and that did a slow burn.