Did you take his temperature?
You can't rely on how warm he "feels."
I have a 19 month old too.
There is a lot of sickness going around.
Take his temperature and if he has a fever, take him to the doctor, or call them to ask what is best. They might just tell you to give him 1/2 teaspoon of Tylenol.
Has he had a nap at all? My little one gets so cranky sometimes if she doesn't nap. I have to put on soft music in her room to calm her down and sometimes I just have to let her cry it out. It's hard, but she got the point that bedtime means bedtime.