I have never done therapy before and no one in my family has. I have zero idea what to do.

First, what kind of therapist do I go to? Do I need to have a specific problem or just want someone to evaluate me? Also I have insurance but I have no idea of the benefits --will they pay for therapy if I don't have a "diagnosis".

I don't think I have a diagnosis. I feel like I have a few problems that aren't going away.

1. my constant persistent desire to lose weight, and failing, seems to be turning into an eating disorder... binge, diet, binge diet.
2. I am unable to deal with people lately. I think as a kid I was open and trusting but after 30+ years of negative and nasty people I am a person I don't recognize and don't want to be, but can't control.
3. I am afraid of a whole bunch of stupid things that literally can ruin my time off, my cat getting stick, my house / appliances... moving. They ruin my day and make me want to go to work.
4. I have lost all ability to want to do anything. I remember as a 20 year old I packed up my car and cat and drove across the US by myself. Now I can hardly go out on the weekend or, even, do things in my own house. All I want to do is sit in my house and play on the internet.
5. I seem to get into things I don't want to be doing and I can't find my way out of but at the same time, everyone seems mad at me for not doing what they want. It seems like everyone I meet just wants me to do what they want me to do and am angry if I don't.

Also, I need to do this on the weekend! I just don't have enough time off during the week.