Do you have someone you can talk to? You really need to stop stressing and take a pregnancy test. If you are that stressed out, it could be the reason you haven't started. If it is not the reason, you still need to stop stressing and find out whether you are pregnant or not. Stress isn't good for the baby. The sick part sound like you are pregnant (but could be nerves), but the not being able to sleep sounds like you are not. Normally when you get pregnant, all you want to do is sleep. Either way you need to know.
Take a pregnancy test. That's the only way to know if you're pregnant or not. You can't diagnose pregnancy over a forum. :) You did mention you were stressed, and sometimes that causes a delay in your cycle.