the only real test to find out you have CHS is to quit smoking and see if you get better . it sounds like you could have CHS . with this disease all tests always come back negative but it starts shutting down your digestive system , you get dehydrated because your liver shuts down and people end up at the er needing fluids or if you start puking nonstop the same thing happens plus it inflames your stomach causing gastritis and ibs . it can also hurt your lungs . last year my Doctor sent me for an chest xray and told me i had calcium deposits in my lungs which i figured is caused by my smoking . if it is CHS your body is basically allergic to pot and your immune system is going nuts , that is how i feel if i continue smoking . hope you figure out what is wrong . just remember i said you could have it but if your Doctors say they cant find anything wrong then i would say you do .