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lasting for month is a bit concerning.
following an injury usually resolves in a few weeks. As you report the pain is getting worse since a month, I would not relate the pain to an injury.
Lower right quadrant abdominal pain radiating to umbilicus
is typical of appendicular pain, but as you have had your appendix removed, other less common cause such as mesentric lymphadenitis
needs to be considered. An ultrasound
examination will be useful to determine the true cause.
I encourage you to visit your local gastroenterologist for a detailed examination.
Hope this helps.
Wish you good health