You would need some basic investigation to be done along with certain medications.
The cause of weight loss needs to be evaluated.
Get a Cbc,
thyroid profile, Vit b levels checked.
Any history of bleeding while passing stools or pain while passing stools?
Do you feel lethargic/weakness throughout day?
Any history of anxiety?
Need more detail history for proper evaluation and management
For relief from constipation
Take syp cremaffin
Next Steps
Consult me on practo for further assistance