Life in general, is hard

I'm going crazy. My son doesn't like to eat, I can't quit smoking, I hate my job, and there is nothing I can do about it. I've taken up knitting in the hopes that it'll distract me while I attempt to quit smoking, But I've been scared to even try to quit. I hate my job because they are replacing me, and not telling me about it. My son is 4 and is the pickiest eater on the planet. He is driving me crazy with that. I can't take it anymore. I'm about ready to take him to a psychologist about it.
I feel so disconnected from everything right now. I remember feeling like this before, and nothing good came of it. I feel like sometimes, I'm watching myself as if I'm in a movie, following around myself with the camera. I hate leaving the house anymore, but I really want to do things. I want to make some friends, because I don't really have any. I thought that getting a job would help with that, but the only people that I talk to are teenagers, because that's all they have there. I feel so alone sometimes. Since Audrey's been gone, I have nobody to take care of, and, I'm loosing my mind from it. I don't know what to do. I really, really think it was a bad idea coming here.