Stalker/Thief

Who ever it has been for 25 years stalking me they are a thief too.  They get in my house when I go out somewhere.  It is almost everyday,  They take what ever they want,  My clothes, food, guns, jewelry, toilet paper, soap etc. I don't know why they are not getting caught. I've even set traps for the thief and they get past them to.  I wish they would get out of my life.  It cost me a lot of money I don't really have to replace what the thief has taken.
The stalker/thief had the nerve to take my car out one night when I was sleeping.  He put 100 miles on my car.  I know this because when I got in my car the next day my gas had gone down, when I filled up the tank.  He must be close by to do all this.
I've called the Sheriff so many times, that they don't believe me anymore. 
What am I ever going to be able to do about this person doing this. I believe this stalker/thief is into drugs.  I would have never hit Rachel from Goodwill if I was not on some kind of drug.  Also I never would have done other stupid things if I were not on some kind of drug.  Bad behavior is just not the kind of person I am. I'll tell you something else that makes me believe I was drugged. I was walking around my house nude in the middle of winter.  My house is cold in the winter too.  Also I called the Sheriff every rotten name I could think of on the phone.
Also I wrote to world leaders, which is not unusual for me.  The thing is I do not remember what I said to them in those letters.  I can usually remember what I wrote about.
 Something has been going on for 24 years.  The way I was acting is just not like me.  How am I going to stop the stalker.  Why does the stalker keep bothering me.