hoping to hear from other moms out there that this might be normal?

My 6.5 month old has never been the type to cry at bedtime and now all of a sudden for almost 2 weeks now she cries and screams the first half of the night and nothing will calm her down. she starts bedtime at 7-7:30 and by 8pm I can usually lay her down in her crib but now she starts screaming within 20 minutes of drinking her bottle she'll be asleep in my arms for 15-20 min and then just start crying uncontrollably. She already has 2 teeth that poked through at 4 months and I dont see any new teeth, I do give her motrin before bed when she started this because I wasnt sure if it was teething. I dont know what else to do and shes never been this way before. after about 11pm she finally settles and I can finally lay her down but the first 2-4 hours are rough I hate to see her cry and nothing i do will soothe her. during the day she seems normal and fine I just dont get why all of a sudden she screams and cries around the same time every night for hours at a time

Has this happend to anyone else?? how long did it last?? any advice??