Sleep regression?!

Is this it? The dreaded 18 month sleep regression? Nonstop crying for the last 3 hours. My husband and I have been taking turns and trying to give him time to fall asleep on his own to no avail. I even gave him Tylenol thinking it could be his molars. He stops crying within moments of being picked up. Goes back down and is crying 5-15 mins later. 😭😭😭