I havent had my appendix removed but i would say the abdominal pain is normal, your body is re adjusting to not having that organ there, i would recommend seeing your dr who did you surgery or something, because sometimes u can experience blood clots in your legs following surgerys, i was givens shots in my legs post gallbladder surgery to prevent the blood from clotting so you might wanna get that checked out because blood clots can travel and if they get up to your heart that can potentially kill you, so i would definately for sure go see your dr to make sure that is not what is causing your pain.