Lower back

I’m 22 weeks pregnant && I have severeeeee lower back pain. As I get further along it gets worse.!!!!! It’s so bad when I walk I have to put my hand on my lower back & add some pressure rubbing it. When I walk & lift my left leg to walk I get a sharp shooting right pain in my back (my leg doesn’t hurt). I lay down & it hurts a lot still .. when my niece jumps on the bed or moves too much it hurts worse. My OB says round ligament pain & lower back pain is normal but it doesn’t feel normal whatsoever😩😩what can I do.!?? This my third pregnancy