I'm in the same boat, and I feel your pain! I've never had one this difficult. I think he has attachment issues, as mom was absent alot during the first year. Putting in the playpen just makes this one scream louder and vomit. Hasn't slept for 5 minutes since he stated full time 3 weeks ago-I'm losing my mind! I've tried all the standard tricks, and he won't sleep-period.(usually rocked to sleep at home) He is here close to 10hrs a day, and no one is sleeping or playing like they usually would. I wish I could offer up some ideas, but I'm stuck too. Tried all the suggestions mentioned by 5 Little Monkeys-none working. Childs screams are blood-curdling screams, not normal crying. Also had the neighbours ask what's going on, as they can hear him inside their houses too. I feel bad for the other kids, as they're basically getting none of my attention at this point-lots of free play, but very hard to do a circle or get art on the table. If you find something that works, please let me know.