Low Left Quadrant Back (muscle strain) post deadlift (2 months)

Do I go to PT at this point. I got CXR and was (-) for like a fracture or something. No radiating pain so probably not disc herniation or something. Why is this muscle strain taking so long to heal. Idk what to do, put pullows under my knee?

I am fairly confident I pulled a muslce or something like that or strain. What is throwing me for a bender is how long its taking to heal. I do wonder if I reinjure it if I go to gym too quick but I am making sure I am doing exercises where this part of my back is kept stable and not really moving and its not teneable to not activate it based on daily living. Like sometimes it hurts if I stand too long need to lean back.