Thanks for choosing HCM.
Please note that your symptoms can be due to various reasons. But it is wiser ruling out the serious ones like the prolapsed disc in the vertebral
There are some clinical tests which can reasonably detect what could be the problem by your doctor.
However do the following-
1] Give sufficient rest to back.
2] Hot water / bag / electric patch fomentation to the back.
3] No massaging please.
4] No exertional activities for 2 weeks.
5] X-ray of lower back [ MRI
of lower back if needed]
You have not mentioned your gender as in females pelvic problems may have to be looked into.