Lower back pain

I'm really really struggling with lower back pain! I saw my osteopath a week ago and she said all looks fine and it'll just be everything stretching but I'm still in so much pain! I have a very clingy two year old who wants picking up all the time which probably isn't helping. Has anyone had lower back pain and has found something that's made it better? It started at 13 weeks and I'm now 15+6 x