Another anxiety insomniac here!
Please don't think Samaritans will think you're stupid, after a particularly bad event my DH rang them for advice and I ended up speaking with them. They were really great and did help, I had previously put off calling them as I assumed I wasn't "bad enough" 
Are you on any medications? My ADs used to trigger restless leg syndrome and it was just horrific. Its funny you should talk about feeling it in your stomach as I was just telling DH tonight that when I'm having a 'bad head' day I can feel it in my stomach. Like constant butterflies but almost verging on painful.
My counsellor taught me a good trick which helps me fall asleep:
Lay in bed and close your eyes. Count to 20 then open your eyes for 2 seconds, close them again and count to 25, open for 2 seconds then the same for 30 etc... it does work sometimes. My other go to method is to close my eyes and decorate my dream
house from top to bottom, like an imaginary game of sims. Wallpaper, sofas, furniture, colours...
You will get through this OP. The nights are the worst but you're not alone