7 month old not sleeping!

For the past two weeks she hasn’t slept well. She usually goes to bed between 8pm-9pm and sleeps most of the night without fully waking up. Lately she will sleep at most 30-45 minutes in her crib alone and then wakes up and screams until I get her. Then last night every 30 minutes she was crying and kicking. She does have a top tooth coming in, but I gave her some Motrin before bed (Doctors orders). She is super happy during the day and takes a nap just fine. I’m really at a loss at what to do. It’s just me and I really need some sleep. Anyone else go through something like this?