I have small hard lumps under my skin all over my body. i also have difficulty swallowing, chronic dry cough and body pain. what is this?

Arthritic disease or: Cough alone could be many things including asthma post nasal drainage, or acid reflux, but to put all the symptoms together it sounds like you may have a rheumatic disease such as lupus or schleroderma or a vascular disease. I recommend you see your primary care physician, and he or she will probably refer you to a pulmonologist or a rheumatologist.