Hey Dawn, the thinking too much is a malady I have always been cursed with. I say to myself, STOP, and think of something else. Sometimes it works, sometimes not.

About the credit. Try getting a credit card associated with a store. They are easier than the big ones. And go from there.
Do you have your own bank account? If not, open one. Good idea to check credit report.

Though I know its hard, try to go to bed the same time every night. You might toss and turn for hours but do it anyway. Keep the room dark and quiet.

Good luck with it all. You are doing great!