How do you sleep !?

I have sciatica so bad.. and probably spd.. so I CAN NOT sleep on my sides .. if I do for more than 20 minutes I can barley roll over and I can barley walk. It literally feels like my back is going to snap in half... I can sleep comfortably on my back but I know we’re not supposed to (I’m 32 weeks) I’ve used pillows to prop me up so I’m basically sitting but then my butt goes numb , I’ve tried a recliner but that’s only comfortable for so long :( please help.. what’s helped you? I have tried a pillow between my legs .. I legit just can’t sleep on my sides anymore