The right side of my back has been tight for a few weeks, and its esspecially bad today. it is very difficult to twist and uncomfortable to walk, sit, stand. what should i do?

Doctor can examine: Common causes of back tightness or pain include: back muscle strain, back ligament sprain, disc problem, spinal stenosis, osteoarthritis, urine infection, kidney infection, kidney stone, tumor in the spine or other places, fractured vertebra, fibromyalgia, some other infection, etc... With such a list of possibilities, one's primary care doctor needs to evaluate, plus maybe add physical therapy.