Drink a tall glass of cold water with ice lie on your left side.
You need to go to the ER, Sarah. You've already tried what they would tell you to do - drink sugary juice and lie down on your side.
Since that didn't wake your baby up, you need to be seen.
I see these posts on here all the time and almost always the baby is fine, but now's the time to do something if there's a problem.
I did end up coming to the ER, the heart rate is good but they couldn't get him to move at first either. he's jumped around a few times now, and I'm feeling way more at ease. thank you!