I am suffering from rheumatoid arthritis for past 15 years, which has now affected my whole body. Since one and a half year, I am getting shortness of breath and cough. Last year, when I was admitted in the hospital to get this treated, my doctor advised me to use external oxygen for long term. Since then, I am using oxygen concentrator. Over a month, my shortness of breath and cough has increased and I am finding difficulty even in speaking. Please help.