My Friend Has These Coughing And Gagging Fits To Where

My friend has these coughing and gagging fits to where they some times throw up but mostly not ...Here lately they have be gagging so hard that they blackout and hurt themselves ..They also get a naussa feeling along with dizziness..they have lost their appitete and the smell of food makes them sick ...in a week and half they have lost 9 or more pounds ..