According to your sign and symptom and the history you are suffering from gastroenteritis disease.
And sore throat and slight congestion indicate you have secondry infection with gastroenteritis disease because when your body is week then you can get infection easily.
You should take better treatment to cure of the above sign and symptom.
For better treatment You should take consultation for correct diagnosis .
Next Steps
you should do test like CBC, ESR and typhoid test to find out the exact cause of problem.
Health Tips
please keep positive attitude to fight any disease and any problem of your life.