Due to disc bulge you are feeling lower back pain, improper posture, prolonged standing, deficiency of
calcium, no rest, long sitting on chair or improperlying on bed and using screen, there are many reasons for this.
You can visit nearest physiotherapy center and take IFT+US for 10-15 days to reduce pain adn later lower back muscle strengthening exercises will help reduce pain and gain strength completely.
Maintain proper posture, dont bend forward or backward, no heavy lifting, proper sleep and if taken 1 week complete rest with physio treatment it can be reduced in 10 days as well.