I have a lower back pain,  it is centred around my tail-bone and hurts when I try to stand or move.  It is very difficult to stand up straight and I feel very stiff.  When I cough I get a sharp pain in the area around my tail-bone.  What should I do to ease the pain?
You should go for some exercises and maintain appropriate posture to relieve your pain. Leg raising exercises and isometrics will be beneficial for you. Try to lie on your side always, keeping a pillow b/w your knees while sleeping, avoid lifting heavy weights.