I Have Low Back Left Sided Pain, Grabs/kind Of Like

I have low back left sided pain, grabs/kind of like spasms, hurts about every few steps I take and worse with getting in the car and out and stepping like getting out of the shower. I've been doing motrin, icy hot with heating pad at night and tiger balm patch during the day. I think I hurt it having sex and then worsened it by riding roller coasters. It's been 2 days now. I don't get much relief from anything I've tried. last night I found an old flexeril of my mother inlaws and tried that but it didn't work either. I cancelled all my workout adventures for the next few days. This pain is like an 8, like I tear up a few times during the day. I'm thinking I just have to wait it out a couple weeks and rest it with nsaids. would you recommend anything else. I haven't tired ice yet.