I have severe allergies and asthma, eventually those allergies caused me sinusitis and nasal polyps, I have had 2 surgical operations because or that, the last one was 2 years ago, a couples of months ago I started feeling congestion, lose of smell and taste, and the Specialist told me I have polyps again, the usual treatment I have taken is antibiotics and prednisone, which after a couples of days I feel much better, eventually the congestion come back again after two months of taking the medicines, and I have to repeat the treatment all over again, how much time do I can take prednisone before my body get harm for the side effects?