25F back pain, recurrent with no trigger

Attaching my MRI for reference (taken in 2023). I got sciatica 7 years ago and it healed on its own. Since then every year i used to get it once a year or so. But now the pain has changed..it's near groin region but sometimes changes its position to upwards too. Feels like something is tensed and pinching. It usually lasts for 2 weeks and goes away but now it's persistent. It feels ok when walking. But sitting and lying down feels uncomfortable regardless of position. I used to be sedentary years ago but now i walk 10k steps and don't sit much. Still this happens. I have given up on a lot of things due to this pain. I have no idea what's the cause and how to fix. I only get prescribed pain meds. But i really want to know why this is happening..im only 25, no unhealthy habits and am at normal BMI. I don't lift weights.This makes me depressed every night. Please help me.