Inhaled steroids are generally preferred over oral steroids because they have far fewer side effects. That being said, if you are concerned that you may be experiencing an unusual side effect from Symbicort, I would recommend talking to your Pulmonary Specialist.
Symbicort Side Effects - MedHelp:
http://www.medhelp.org/drugs/Symbicort/show/3420
Symbicort Prescribing Information - Astrazeneca/Symbicort USA
http://www1.astrazeneca-us.com/pi/symbicort.pdf