I’ve been to a doctor prior discussing my lower back pain and during the exam the doctor pressed on a spot in my spine that caused intense pain, but I can’t for the life of me remember where she pressed. I did however get an x-ray done that showed partial sacralization. I was sent in for PT and instructed to do a few stretches: a lower back flexibility exercise, hamstring stretch, and forward lunges. Which I do and it relieves pain for a bit, but it comes back in about 2 or so hours. Also, if I do not do these stretches it is impossible for me to have a bowel movement. I’ve also been diagnosed with an unknown connective tissue disorder, and occasionally have a sharper but intense pain at the very top of my back where it meets my skull, not sure if it is related but thought I’d mention it anyways.
Partial sacralization of L5 on S1 generally does not cause pain. Tenderness of a spot on the lower back is also not diagnostic of a spinal disorder in general. A connective tissue disorder (like rheumatoid arthritis or fibromyalgia) might very well cause some or most of your pain.
You need a good spine physician to give you a once over to figure out what causes your symptoms.