Leaving baby for first time

I just need to vent im so anxious about leaving my son for the first time.

It's only for a few hours and he's going to be with my grandmother but it's to go see Rocky Horror so we're going to be gone from about 8:30-11:45 ish which is bed time...ish

He's had a bottle before and can eat from them but he's not huge on them. And we go to see my grandma pretty much every day so I'm not worried about that. But he's super clingy to me right now and I keep thinking about him getting upset and ughhhh it's so hard. 😩