Chiropractic Mobilization will help. Avoid bending in front. Postural Correction- Sit Tall, Walk Tall. Extension Exercises x 15 times x twice daily. Apply Hot Fomentation twice daily. https://www.youtube.com/watch?v=HxvRQ9ZJ8vQ

First understand the cause of your pain before taking any more medicines, this video will be useful for better understanding.

My suggestion is to plz consult any physiotherapist

You should to start physiotherapy treatment

Its a postural issues. You can consult online and get that solved

You need to consult in perosn for proper diagnosis and treatment, its due to improper sitting on bean bag might have caused compression. Stretching will help release the pain, this can only be done if you consult in perosn. Maintain proper posture, avoid prolonged sitting. Hot pack twice a day will help reduce pain slowly. If the pain is severe as of now can take Zerodol SP twice a day but do consult in person for treatment.

I think you’re having muscle tightness Posterior thigh muscles - you need to do hot water fermentation first over yur back area and back of thigh and leg follows slow sustained stretches , stretches will help you out . But first for detailed assement consult physio nearby And they’ll b helping you to list of muscle which need to be strengthened and stretched

Looks like stiffness of your pelvic bone. You could  benefit from mobilization, exercises and electrotherapy.