Until your figure out what your anxious about take some herbal sleep aids like vilarium root. But try to find out where your anxiety is steming from. Work, relationsips, school, finances. Anxiety arises from the fear of not being in control and can set off natural chemicals in your body that will make you freak out. Figure out what it is and get control of it.
I think that almost all of us that have anxiety have been through this. You're right, it is just so awful.