Y'all please help this mama out!!!!

My 2nd born son is 16 months old, and just all of a sudden HATES sleep!!! He was such a good sleeper as newborn up till now. Nothing major has changed. His bed time and routine is still the exact same as it was since I can't even remember... maybe 5-6 months old? He only takes 1 nap a day now and has been since a little bit before turning 12 months. And they're like 2 sometimes 3 hours long. He usually falls asleep at 11 am, wakes up at 2.

Buuuut lately when it's bedtime we will do our nightly routine and everything will be fine. Lay him down, he will mess around for maybe 10 minutes like normal then he starts screaming and crying out of nowehere!! And he just doesn't stop. So we eventually have to get him and hold him out in the living room until he falls asleep. But sometimes when we go lay him back he wakes up and it's game time all over again. Once he finally stays asleep, he then will wake up several times through out the night or we might get lucky and it might be twice. But that's a nightmare itself since again, he will just scream and cry. We will lay him back down, try to pat his little butt or rub his back facing away from us (doctors orders) and nothing!! It's just a constant fight until he finally gives up.

I took him to the pediatrician to see if maybe something was wrong that I wasn't seeing. But everything has checked out fine. Our Dr. Did say some do go through a sleep regression around this time. He gave me a couple of little tips. But they aren't helping. I swear I have never been so tired in my life. Our first had colic, I thought I was tired then. HAHA. What a joke.

Please someone help. I just want to sleep a full night again.