Oh sweetheart I'm so sorry.
I don't know whether it will help or not, but I don't think you are in limbo anymore really hun. They can't see a heartbeat or a fetal pole and you're measuring so far behind. The only thing that is growing is the sac and you should be able to clearly see a baby by now. You're so certain of your dates too that there's no way you could be so far out.
I think it's so bad that you can't get any help yet but I guess the hospital had to stick to it's policies as they are in place for a reason.
I know it's so hard to accept what's happening and you've been told the worst, then told that was wrong and it's only normal to pray for a miracle. But, for your own sake, for your own self preservation I would try and assume the worst and come to terms with it.
You have fought so long and hard to get here and it's so very unfair that it's been taken from you. You've coped so well and handled yourself with such dignity. You are an inspiration to do many women on here, to never give up on your dream of becoming a mummy.
It all feels so hopeless now but one day, when you hold that tiny baby in your arms and you look down into that little perfect face, all of this will have been worth it. That's what I have to tell myself every day when it all feels too much.
Big hugs sweetheart.
XX