Does anyone have any suggestions for really bad pregnacy back pain??? Please :(?

I am 7 months pregnant. This week all of the sudden, I have had terrible upper back pain. No matter how I lay, sit, stand it hurts. It’s been 3 days and I have had less than 4 hours of sleep each night. I have tried pillows of all shapes and sizes- hot showers and baths- back rubs from my husband- Icy Hot patches- and Tylenol. Nothing is helping… I called the doctor on call tonight and he said other than taking Tylenol pm to help me sleep there wasn’t anything he could do tonight. I said he can see me in the morning. My husband is out getting Tylenol pm now. But does anyone have any other ideas for me on how to help my back feel better. I would really love some relief right now.