Back pains getting me down

Im 36wks today but for the last week or so the pain in my back is getting me down. It hurts so much. I was taking paracetamol for it but then realised taking too many can be bad for you so i brought a birthing ball (recommended by hospital mw) that only takes the edge off. I just wanna lye down all the time but with a nearly 3yo thats impossible.

If i stand or walk for too long my back ache just makes me cry and then if ive sat down or led down, to get back up again im like jelly.

Does anyone have any ideas what else i can do or take to help ease the pain please