How do you know if your have a pinch nerve in your lower back?

Back at the end of February I had got muscle spasm on the right side of my body, from the top of my back all the way down to my calf in my right leg. After about a month or two everything was feeling better except this pain I get in between my hip and my booty area. If I'm walking and step a certain way it hurts or when I roll over in bed it hurt, or if I'm laying on my back and try to sit up it hurts. If I sit for about 20 minutes, when I get up and the first two steps I take it hurts. I can't walk or run to fast because it hurts and getting in and out of cars it hurt. Does this sound like I can have a pinch nerve in my lower back? Tell what you think it can be because I done tried everything and it wont go away. Please only serious answers only! Thanks!