Dear Pink28, I know all to well how it feels to be insecure about ones' competence. I agree with everything Shezbut says but for me TV is great. I use it to baby-sit my mind by distracting it. But everyone is different. I also use white noise--ocean sounds. I also distract myself with mahjong solitaire and hidden object games also find the difference games. These kind of games get my attention just enough without overwhelming me.
My journal is essential. I've kept it up four 4 years now. It helps to get out on paper.
Maybe it can help to ask questions at your new job so you'll feel more in control of the situation.
I hope you can get some rest and feel better.