what is wrong with my body (TMI)

so for some reason anytime i eat anything i immediately don’t feel good. like soon after i finish a meal, i have to go to the bathroom and get something out of me no matter which end. (and it’s never usually solid) .i thought it was my diet, so i started eating healthier, but it still happens! i don’t want to go to the doctor just for him to say something that’s obvious and stupid, so i was hoping you wonderful ladies would have any idea as to what the fuck is going on?