How to soothe back pain @ home?

Randi • Blessed with a baby boy 💙
It's 4:00 in the morning and I am actually so close to bawling my eyes out. I keep having lower back pain on the right side, it's not constant, every once in a while it's a sharp jolt and it's starting to become unbearable. I've never felt this. I will be 29 weeks tomorrow. I drank a glass of milk thinking this would make me tired and now this. Does anyone have any recommendations on what I can do here at home to soothe the pain????? I have to go to the hospital in a few hours for information on gestational diabetes and plan on bringing this up then, just need some relief for the time being so I can get a couple hours of sleep!