Had a similar story. After having kids and carrying them around a lot, coupled with no exercise at all, I had an episode of intense lower back pain. After an xray, any structural problem was discarded, I needed exercise to keep my posture.

I then decided that I need to carry on working on a desk for decades ahead (I'm on early 30s) so I had to tackle the problem.

Was recommended by my daughter's pediatrician to look into Pilates classes. I'm now pain free and results came very early on in practice.

Also, random pain spots that appeared frequently (for instance knee pain while driving) are mostly gone too.