I have psoriatic arthritis, currently taking methotrexate (0.6cc injection), was taking humira (pre-filled pen until recently). A few weeks ago while I was backpacking, I experienced an uncomfortable shortness of breath after eating a freeze dried meal, sulfites were listed in the ingredients list. Since then, I have noticed shallow breathing at all times of day and I have been becoming more easily winded when I exercise, which I try to do regularly. I ve also been feeling rather tired, lethargic, with some infrequent irritability and mild nausea. What are the possible diagnoses?