Hi, can you give more details on your pain? When does it hurt? Does it hurt all the time or certain times in a day?

In my opinion u must get an x ray done of LS spine ap view and lat. view... after that h need to go for few blood test like vitamin dcalcium vitamin b 12...if they are deranged then u need to take supplement medications for that...start physiotherapy sessions immediately to get relief... IFT / hotpack and US...can be the choice of treatment as it depends physio to physio... get well soon take care...

Postural Correction- Sit Tall, Walk Tall. Extension Exercises x 15 times x twice daily. Apply Hot Fomentation twice daily. Avoid bending in front

For spine diagnostics, MRI is necessary...Ensure that you maintain an appropriate posture while working or sitting or walking....Take frequent stretch breaks and drink lots of water...Discontinue using pillow while sleeping straight...Do not lift heavy objects, especially after bending down....Eat a healthy wholesome meal which should satisfy your minerals and proteins requirement...take over the counter pain medications.. Consult nearest orthopedic surgeon they will do the needful.

Precautions and exercises are the first line of treatment.  I am sending you the link of the same https://play.google.com/store/apps/details?id=com.backpainrelieving.backpain