Fatty foods causing problems

I dont know whats wrong with me.  I have been on a healthy diet for about a year and a half to lose weight.  Im an athlete and exercise all the time.  Now im already below my initial goal weight and still eat healthy but everytime i eat anything that is even remotely greasy i get nautious, gassy, and have stomach pains.  most times also diahrea.  I usually feel like i want to throw up but cant.  what can be causing this?  i dont have cholesterol problems or anything else for that matter if that helps.

[Firefae25]

it may at worse your gal bladder at best you aren't used to them...best to avoid