Hello~You could have some misplaced vertebrae in your spine, seeing a chiropractor would probably be beneficial as they specialize in back and neck pain. He/she will take some x-rays, study them, and then discuss the results with you and the plan of action. After a few treatments, you should start to feel better.
Hello and welcome to the forum. Thank you for the question. We always encourage people to get checked out by their doctor. I would suspect from your description that you have sciatica at this time. That's a pinched nerve. Heat, ice and stretching normally can resolve this. https://www.healthline.com/health/lower-back-pain-left-side-above-buttocks