Pressure/dull ache under right rib?

this started about 10 days ago,firstly with a pressure type,dull ache feeling under my right rib,this feeling didn't leave and my symptoms progressed further, i totaly lost my apetite,my tummy feels bloated and i keep feeling i need to burp and pass wind! when i do eat i get a severe cramping at the top of my stomach right under the centre of my rib cage,when i try to swallow food feels as though it's getting stuck,the pain seems to have started to ease but i have right shoulder pain as well now!!! HELPPPPPP!!!!!