Sleep issues

I am at the end of my rope with Reese's sleep issues....
She has NEVER been a great sleeper. As an infant she woke up like 6 times a night. And didn't sleep through the night until she was like 18 months old, and even then she still wakes up most nights at least once. Usually I can just give her a paci and tuck her back in and she goes back to sleep. Starting this summer she would wake up around 1 or 2 am and she would just be awake for a couple hours. Letting her cry it out wouldn't work,so I just started putting her in my bed and letting her watch tv until she would fall back to sleep. Then either I would just leave her in my bed or put her back in her bed(it would all depend if I fell asleep, then was too lazy to take her back to her room) but it was so random. She would do it for a night or two then she would sleep great for a couple weeks.
We went on a couple of trips and to my surprise she slept great. Even camping she didn't make a peep at all. Then all of a sudden last week she started this entirely new issue. She will go to bed at her regular time, go right to sleep without a whine or cry and be OUT. Then EXACTLY one hour after she goes to bed she wakes up and she is completely freaked out. She screams and cries like I have never heard her do. She kicks the side of her crib and panics. It is heartbreaking to hear. Then when I go in to get her she is dripping in sweat and shaking and grabs on to me so tight. Once we are out of her room she is fine and happy as can be. Great....she is afraid of her room. I don't know if she is having nightmares. She has TWO night lights in her room and a sound machine that she has slept with since day one.
And it is random too. She will do this for a couple nights, then sleep fine for a couple nights.
Ahhhhhhh
It is SOOOO frustrating. The time after she goes to bed is when I clean up my house, relax, and actually have time to MYSELF! Oh and I forgot to add that she only does this on the nights Jim is working. So he has no idea what actually happens. He thinks she is just not sleeping but this is different and that's what so hard and bothers me.
I really hope this is just a short phase and that she goes back to better sleeping habits.