I don't like to hear you say you've been "sat with your head in your hands" because that will just give you more opportunity to dwell on your fears - and, as you say, "stress makes it worse". I think you should try to find something more active to do and to think about. Exercise, in particular, is always good for you as it will help you produce calming brain chemicals, and getting physically tired will help you sleep better. Don't give up!