Back pain at work?

I've been working at a garden center for a week now, following the winter break. There, I have to bend down a lot and often lift heavy things. Since my second day back, I've had pain in my lower lumbar spine, or rather, in the area of ​​my sciatic nerve. The pain gets worse with prolonged bent-over posture or lifting. It only gets better when I sit down. Last year, I also had similar "initial pain," but it got better over time. About me: I'm 26 years old and have a pronounced hunchback with a pronounced hollow back.

In your opinion, is the pain harmless or could it already be a herniated disc?

LG..