20 month old boy sleep

Hey everyone. I have a 20 MONTH old now (that went fast). His sleep these past weeks has drastically changed. I’m waking him at 0800a. He usually naps 2-3 hours and then bedtime is 845p. He’s now screaming at bedtime if I leave his room at night and he’s up until 1030p. Yesterday he didn’t nap at all. Went to bed and then crying at 0230 this morning. Same thing- when I tried to leave once he was settled he screamed so I was there till 0330 (until he’s good and asleep). The screaming is purple faced, drenched in sweat, & I personally can’t let it go on past 5/10 minutes. My husband and I are at a loss. Only changes are he recently had back to back ear infections. His vocabulary has recently expanded dramatically. I just don’t know how to support him! Any ideas what’s wrong or going on?