I was so scared of it that I would actually convince myself I wasn't sleeping when I was.
what helped was (and this is a lot easier said then done) not worrying if I couldn't sleep. telling myself, it's okay, just get up and have a read of a book for an hour/watch tv/knit/etc then try again. If I can't sleep it's not the end of the world.
generally I'd do something really boring, then try again.
there were some nights where I struggled to fall asleep, & Id stay calm but after 3/4 hours of not sleeping I'd find myself getting panicky & on the verge of panic attack. it's hard.
I also thought I was completely alone in this.. I've told some people before and theyd look at me as if I were crazy "why would you be afraid of not falling asleep? what a stupid thing to be afraid of" so that didn't help either.
for me, sleeping next to my partner is my biggest thing, just knowing I can wake him if I can't sleep helps ease my mind (even though I wouldn't actually wake him anyway) but now I've become reliant on him as my "safety net" so I get panicked when he goes away for a night.
the key is to try as hard as you can to relax & not get into a panicked state if you can't sleep as that will just aggravate the problem.
maybe listen to some radio while falling asleep?
one that helps a lot was to think of a 5 syllable phrase (mine was always "I will fall asleep") & with your in breath say "I" out breath say "will" in breath say "fall" so on so forth. (obviously dont say it out loud just in your mind) if you stray from this (which you generally will) just don't fret and to back to it until you fall asleep.
I don't know if you've already heard all this before, if you have I apologise, but these are things that have worked for me. you just have to practise it. get into the habit of spending an hour before bed getting into a deep relaxed state (even try meditation if you can do it - I can never seem to "get" there)
good luck, and just remember you're not alone!! Huge huge HUGE hugs xxxx A