Uy, mama, I know that back pain and numbness can be really uncomfortable, a few of us pregnant moms experienced the same thing towards the end, kaya alam ko kung gaano kasakit! But please see your OB as soon as you can, ha, especially since you're 36 weeks na, kailangan i-check ng doctor kung ano ang cause para sigurado na okay ka at baby mo. Only your doctor can tell you kung malapit na talaga ang labor or kung may ibang kailangan gawin, so don't wait, go na!