Hello. Very Good evening. These are the sideeffects of oral corticosteroid,  a synthetic one known as prednisolone, but for which ailment you are advised to take oral steroids. Oral steroids are usually required in autoimmune disease, kidney Diseases, rheumatoid arthritis and the list is very long. Major sideeffects are Acid peptic Disorder, prolonged use can produce osteopenia or Osteoporosis which makes your bone week. But I Medicine,  there is a saying which is risk versis benefit. 20 days is a small period. People take oral omnacortil up to 3 to 6 months depends upon the severity of the symptoms of a disease. Please don't worry and take stress unnecessarily. Trust your Doctor and never loose hope. God is with you,  he will pull out you of these sickness. Regards.

Y r u taking omnacortil for so many days..