I've been getting several recurrent infections and it's starting to effect my work. Why?

Immunodeficiency. Recurrent infections of different types can be due to many causes. If you have recurrent infections, especially if you are an adult with recurrent sinus, and lung (pulmonary) infections, you should see an immunologist and be evaluated for immune deficiency. Everyone is allowed to get "sick" occasionally, but recurrent infections can have an underlying cause that an immunologist can diagnose.