Yesterday I went to put my jacket on and all of a sudden it felt like a pop and not a pop like a knuckle popping more like a gallon popping and after it happened I have been having trouble standing up straight, it hurts if I walk at a normal rate (I have to walk really slow) it hurts to sit, and now it is the next morning and this all hurts ALOT more, and I also feel a lot of pressure, and this pain and pop all happened right in my lower back where the tail bone is(there is not swelling, no heat and no I have not fallen or anything like that)