For the past week now, DS has been often (but not always) waking up earlier in the morning and from naps screaming. Full on screaming. When I go pick him up to rock, he's nearly hyperventilating, crying big ol tears, and clinging to me for dear life. When he wakes up in the morning like this it's typically only an hour earlier than usual, so if after ten min or so if I can't get him calmed down we'll just get up for the day. A lot of times when he wakes up from nap this way, even after getting up and coming into living room he'll still be clingy and scream if we put him down.
So tonight he started doing this after sleeping for 3 hours. He's never done this at/in middle of night. I went in and tried to console him multiple times and even after I'd get him calmed down, if I laid him back in crib he freaked out. This lasted nonstop for nearly two hours. Now he is sleeping for ten min, waking up screaming for ten min, sleeping for ten min, etc.
I feel so bad for him - I can't figure out how to help him. I also have a 5 month old DD and he's already woken her up with his screams once. She's also reverted back to waking 3x/night so I'm already sleep deprived. DS's good sleeping habits were one thing I had going for me at night!! Praying this is a one night thing.
Anyone else have any experience with this?

Re: Night Terrors...? Idk
Also he was overly grumpy and clingy all day today, so I'm thinking possibly teeth? He's never been a thumb sucker but the last couple days he's been kind of chewing on his fingers. I know one of this back teeth has been kind of half in for a while - maybe it's trying to finish pushing through...?
It is heartbreaking. I can't stand hearing him cry and knowing I can't do anything. I can't wait until he can use his words to give me an idea of what's bothering him.
Thanks for replying @Hummingbirdbaby3. I needed the support tonight! Hopefully the worst of tonight is behind me.
She never woke up from them.
As for waking up crying and clingy, DS does that occasionally. Not sure why. We haven't made any association to teething or pain, or hunger.
It mostly happens after a nap. (It could be because he has different people care for him throughout the week and he just wants extra mommy and daddy snuggles?)
GL.
He did just get over a double ear infection so there is a possibility that there was still some lingering pain. Luckily, (knock on wood) that was the only night he's done this.
Now if DD (5 months) would go back to STTN, that'd be awesome!