any advice on reliving lower back pains?

Been getting terrible back pains for like two months now, it's getting to the point where my hips are majorly aching n my legs are getting weak n numb if I walk for more than 10 mins.. I've been to a yoga class designed to help ease back pains n I've also had numerous massages but the pain is getting worse daily. Doctors won't prescribe me anything stronger than paracetamol and Not only am I really worried about this n my concerns are not being taking seriously but I'm just fed up of the pain. So if anyone has any advice n tips on how to help this pain, even just a comfy way to sleep with back ache or have any advice on how to make the doctors take me more seriously then I would really appreciate it.