Most probably the mattress you are sleeping on is not comfortable and is unable to support your body posture. Try sleeping on the ground for a day or two and you will realise there is a difference. Take tablet zerodol SP one tablet 2 times a day for 5 days for your pain. Also you can use hot water bag in your back at night. Avoid sitting on the computer or bending for long hours which also may cause the low back pain.
Next Steps
consulta orthopedics and get x ray spine AP view done to confirm if there is any kind of vertebral changes.
Health Tips
drink milk daily and take
calcium supplements