carol, i saw your posts on the other thread and this one.
My input may be irrelevant to your case but I'll stick my thoughts here just in case they are some use.
From the age of about 7 or 8 my dd was afraid of the dark, of going into the bathroom in the evening, (even when we were all around watching tv, etc), afraid of going into her bedroom if the light was not on, afraid of her cupboard being open. Terrified of getting out of the car, to open the gate for me when it was dark. She's an intelligent kid with a great sense of humour. I realised that her fear was irrational and that she HATED the feeling of the fear. It made her feel stupid, powerless and extremely stressed. I realised trying to convince her she wasn't frightened made no difference. In fact it made her more stressed. So I did the following:
I always went with her to the bathroom when she asked me, even if I felt like screaming with frustration as I was trying to cook dinner. I pretended it was no big deal. I chatted about something else while we were in there. It seemed to calm her.
I told her she would grow out of it.
I told her I understood what a pain it must be to not be comfortable going to the loo alone, but that eventually it would pass.
I found a kid's book about being afraid of things. I didn't make a big deal of the book just gave it to her with a bunch of others. I think she found it amazing that she was not alone, that she could read about another (cartoon) kid who was afraid of stuff.
I walked with her to her bedroom, to put the light on, find her books, put a story cd on.
I tried very hard to take all the pressure off her. (it also took some pressure off me too as I didn't try to fight it)
I made sure she had hobbies and activities to raise her sense of self and of power.
She's 13 now and completely different. I don't know if she would have grown out of it anyway but I do feel that not making her feel abnormal/stupid/a nuisance helped.
Why don't you just make up a campbed in her room for you and tell her whenever she wakes up frightened she can come and get you and you will sleep with her. That way you keep her in her own room. If she comes in the middle of the night keep all your frustration to yourself just say sure, no prob, I'll come to your room.
Or re-arrange your evenings a little (this might seem like forever but it will pass) let her go to bed a little later and you go earlier. Go to bed yourself on your campbed in her room. Or mumsnet in the anteroom if she'll let you. Promise her that you will sleep with her. And keep your promise. So even if she wakes she's allowed to wake you up. That way you don't even have to get out of bed yourself!! Assure her it's no problem, and that this little phase in her life is only a phase and soon she'll grow out of it. Assure her that loads of people have funny habits and grow up into normal people.
I could be wrong but and please forgive me if I'm speaking out of turn but I think you should take all the pressure off her (even giving her a relaxation tape puts some pressure on her to sort herself out). Just give her what she needs and make it easy and stress-free for yourself to do so.