Hehehehe... had the same problem for the past month or so. Chiro really helps foam roll is essential. if it's only one side, it's most likely your piriformis / Glute pressing on the nerve, creating inflamation and affecting the lower back.
Do you have trouble getting up once sitting for a while? That's the main symptom; can walk arround no prob, then sit down and takes 5 mins to get back up.
This is a quote from Alex 23. I have these symptoms and it f-ing blows. Any help you guys can give will really make a difference. Is there any way to fix this without PT?