Where can someon go to get tested for lung cancer in los angeles or california ?

I have been a hard core smoker for 23 years and am trying to stop smokeing cigerettes . Cancer and diabetes run in my family and I am concerned for my health because for a while I have been having signs of lung cancer , I looked up the symptoms and alot of them fit me . I am beginning to get really scared about this and need to find out what is wrong with me and if it is actually what I suspect and am afraid of I am only 33 years old and shouldn't be feeling so fatigued and sick
like I am . Can someone tell me where I can go to get tested for cancer /lung cancer here in Los Angeles or california Thanks Robin Gist in Los Angeles.