First of all u have typhoid, for which treatment should start 1st. Pain between stomach and chest may be due to gastritis or may be coz of posture. As u have back pain also, so it’s coz of ur wrong posture and weight lifting. Need to more detailed history and investigation.
Next Steps
Consult online for proper evaluation and treatment.
Health Tips
Don’t worry much. Eat light diet like Khicdi etc.