Most that use corticle steroids for asthma, will occasionally suffer this problem. While quite disconcerting, its presents no real long term harm to the user. Ask your physician if there are other long term medications that would give you greater control of your asthma, than your rescue inhalers are at present. Then, maybe your taste will return, after you gain control of your condition.
Bummer! Steroids always made me hungry. I would hate to eat all that food and not be able to taste it! I would call the doctors office that wrote the script. I would leave a message with the nurse to consult the doctor; then she can call you back with his advice.