My psychiatrist that I see at CAMHS told me to take deep breaths and try and clear my mind of thoughts.
It doesn't seem to work very well with me since I can never clear my mind and always end up holding my breath and becoming more elated for letting go of all the pressure that I build up, but it's worth a try, it may work with you.
I've also been struggling with binging lately because of stress and I find when I eat large amounts it triggers/makes it worse, esspecualy my sleep.
I know how you feel, Last week I couldn't sleep at all because I was squealing and getting extremely excited because my exams were coming up (out of all things I could be happy about and it was that...)