It's a fact that anxiety can cause all sorts of crazy physical symptoms, which is bad news for us HA sufferers, because then we just start freaking out more, and then we feel worse and so on and so on….
I'm sorry you're having such a tough time, I know what it's like to be in a bad place.
Lack of sleep + anxiety is a bad combination for your body - even small things you wouldn't normally notice will seem amplified x 1000 right now.
Is there anything you can do to try and take your mind off things/relax - or anything that might help you get to sleep? I know it's tough re: reaching out to friends but is there anyone you're close to who can support you? Sometimes it's so helpful just to be able to text someone/call someone who can listen.
If not, hang out on the forum or go into the chat room for a bit - just getting things off your chest somewhere might help, and let you get a decent sleep tonight.
Sorry to be so useless, there is not really a lot I can suggest, but I know how tough this is.
Hang in there.