I'm so tired, but i cannot sleep at all due to hypnic jerks. i was recently diagnosed with anxiety. what can i do?

When I went to: school these were called myoclonic discharges. This is your muscles trying to discharge tension, which obviously you have a lot of... This could be about high anxiety or bad diet/exercise. Try cleaning up the latter and then looking critically at what causes the anxiety. Here's a reference: http://www.psychologyproductsandservices.com/page2.html