Why would anyone live with worries and that too chronically? Worries are just symptoms, not the problems. So, make efforts to solve the underlying issues -- unfinished issues, living with nasty or unpleasant people are two common worry creators.
When you are clear in your mind that you have and are doing everything in your capacity to "clear-up" issues, it gives you emotional freedom from the guilt of not doing your part.
For the rest, follow the advise of michelegoldstein (above). This part needs tolerance, for which faith in god, your won goodness, law of natural justice, larger meaning of life, etc help. It involves accepting the way you are and things are.
Finally, stay in the company of mature, understanding and supportive people to vent out as much as possible.