Night 4- no sleep!

Ladies I am losing it! Last night was the 4th night in a row that DD woke up screaming and continued to do so for 2 hours straight. I have no idea what is going on. She is 15 months old, teething for sure...but nothing seems to help. We basically just keep laying her down and let her scream until she falls asleep. Then she wakes up like nothing ever happened!

HELP! I am so tired, and at a total loss. She is fine during the day. Eats, plays and naps like normal. Just don't know what to do!