Where I live, after having been seen in the hospital for asthma, they automatically put you on a dose of prednisone.
The bloating and the rash are probably from the prednisone. It could take a few weeks for the rash to go away and the bloating and weight gain all depend on your body personally; I've known people to drop the steroid-weight very quickly, and some people who have the damnedest time getting it off.
Good luck!