Not sleeping

My daughter will be 18 months in two weeks. She was always a pretty decent sleeper until two weeks ago. She goes right to sleep but will wake up multiple times. She will cry in her crib for over an hour on and off if I leave her there. The second I go pick her up she’s fine though. I’ve been letting her fall asleep in my bed in the middle of the night cause I can’t take it anymore but now it seems like she’s up for hours wide awake and waking up super early. I don’t know if this is a phase or what but I hope I’m not starting bad habits. I am so exhausted.