What Causes Excess Loss Of Weight,stomach Pain And Unusual Taste In Mouth?

yes i have been to several drs like at the er or my clinic i go to about this issue and they cant seem to figure out what is causing it i have lost a major amount of weight i went from 205 down to 130 n a matter of 4 months because i severe stomach pain severe pains in my side it hurts so bad it locks me up tp where i cant move nor talk now im losing weight again everytime i eat i get sick i have nausea every time i eat than i end up throwing up ive lost my appetite anytime i look at food it makes me sick to my stomach i always have a nasty taste in my mouth that wont go away when i drink something it jus taste like medicine and makes me sick i was trying to figure out who ineed to see or talk to to figure out wats going on thanks