This pain began around the end of summer and it was only a problem when I sat down and tried to get up. Do you know that feeling when you're slouching in a hard chair for a long time then suddenly lift yourself up? It's like that but worse. No matter how I sat or laid, if any pressure was put on it this spot, it hurt. Especially when I tried getting up. When I went back to school, it got pretty bad from having to sit in those hard chairs for an hour and half and then standing up to switch classes. I went to the doctor who told me I have mild scoliosis, but that that shouldn't be what's causing the pain. After a few months, it went away. 

Last week, I was slouching in my chair in class and moved to sit up. When I did, I felt this weird popping feeling at the very end of my spine, and the pain is starting to come back. The popping didn't really hurt, it just felt weird. I don't know if that really has anything to do with it, but I know I felt it a few times before when I had this problem.  

Does anyone know what I'm talking about? I can't find anything online about it and my doctor doesn't have any idea.