Sounds like you are taking action and hope everything gets resolved. Professional advice is key and some scans will make a big difference to understanding if anything major is wrong
I had some painful back problems for about 12 months and after seeing a BUPA physio for 6 months of regular sessions, I went and saw a private but highly recommended Physio who after one session gave me the tools to resolve what had been major problem and was seriously getting me down. Standing from sitting, bending down and back up, along with getting out of bed became big problems and constant pain during my day.
Turned out my Psoas muscle was tight from sitting at a desk, driving and riding. As it tightened it became really painful and put pressure on my back pulling everything out of alignment. This physio worked my psoas and, while it was the most excruciating pain resulting in me swearing my head off at him like I was possessed, I spent the next week pain free. Now I do what he did myself whenever I get pain and I’ve not had any major issues for about 4 months now.
I’m also using a foam roller loads – 3-4 times a week – I’d highly recommend them for IT band and Glute muscles especially. Also the pigeon yoga pose is great for opening up the piriformis muscle which can become tight and lead to sciatic nerve issues.