Michaela and 2 other OB kids who are the same age went through this a couple of months ago (they would have been about 21 months at the time) so it could be an age thing - something to do with seperation anxiety
Michaela grew out of it fairly quickly. The first step though was not pulling her into my bed. It's the easier, more comfortable option and I'm totally pro co-sleep but nowadays I prefer to keep my bed to myself so I stopped allowing her to come to bed with me and would instead comfort her in her own bed. I would go to bed in my own bed as normal but if she began to wake up I'd go to her room asap to resettle her before she'd woken up fully. If I needed to I'd stay in her bed with her. Once I'd broken the habit of her coming into my bed she started resettling herself again.
The other thing was lot's of praise and recognition when she did sleep in her bed all night. Initially she got a stamp for sleeping in her own bed even if I'd ended up sleeping in there with her then she only got stamps if she'd been all night without disturbing me.
I hope you find something that works.