Somehow managed to do my back in yesterday (good and proper) and never been in so much pain

Can barely move, sciatic pain, pins and needles in both feet, physically cannot stand up straight or stand up/sit down or lift my left leg. SWMBO has to help me through the transition from one state to the another, although once there it's not too bad... Still ache but just about bearable now the pain killers I've chucked down my neck have taken the edge off.
Not like me as I rarely suffer real pain and avoid taking pills ordinarily. SWMBO has known me 22 years, watched me walking 3 days after knee surgery and witnessed me go through some rather painful experiences without more than a grimace on my face.
She's rather concerned but I'm hoping to feel a little better tomorrow... Although I have called in sick now.
But, as TB would say... It's only pain. It'll go away!