I get the same pain, it can be excruciating to roll over in bed at night and it catches me through the day every now and then too...it brings tears to my eyes and makes me cry out in pain!!! Bubs position may have a lot to do with your pain too bub may be pressing against a nerve.
I haven't even bothered with panadol as it is likely to do bugger all for that sort of pain. I use heatpacks at bedtime to help get to sleep. I lay on my side cuddling a body pillow between my legs which helps. I get hubby to give me a back rub every now and then. Have you tried using a belly belt/support??? They can shift the weight of your bump and help with back pain too.
You could also try massage or chiro therapy, some people swear by it for helping with pain in pregnancy.