My son is 20 months old. he is screaming at night and is really not himself. he is busy cutting his 15th and 16th teeth, he is not pulling on his ears but i am putting ear drops in. he is also not eating but having 4-7 bottles at night?

Some basics: If a kid is screaming at night & does not stop quickly with your touch, it is not a nightmare but may be a sleep disorder called night terrors (often related to poor sleep quality). If not also screaming during the day it is unlikely true pain. No 20 mo needs to eat during the night, but will if you train them to. It would stop day feeds. Wean off night feeds so he can sleep & this may stop.