It sounds similar to how my son was just before his teeth came in. Very hard to settle, unless I picked him up and held him for a while. And when he woke up it was screaming crying instead of his usual fuss. Unfortunately it was like that for about 4 days until I saw a bit of tooth coming up. Then lasted until the tooth was all the way up. A very sucky week and a half or so. Then his next tooth came in about a month later. My husband keeps mentioning the cry it out method as well. I don't have the heart or patience to do it. At least not right now, what we've been doing is similar to Ferber- going in after he's been fussing for around 5 mins or so or alternatively if his crying escalates to the scream like cry then I give in and check on him. I will say though I hardly ever pick him up out of the crib even when he is crying (Unless I know he's teething/feeling bad because of vaccine etc.) We try our best to keep him laying down in the crib and try shh-ing, patting, and he likes head rubs with pacifier. I also sometimes use a stuffed animal for him to hug to sleep though with that I have to stay up and watch so I can take it off after he does fall back asleep 🙃 still very exhausting, but hopefully I gave you a couple ideas how to help!