Well, the health care thing is rather general and not very specific. Bad, yes, but not specific.
The specific first thing he did was the mentioned mortgage bit. Obama had ordered a 0.25-percentage-point rate cut for FHA-backed mortgages. (In concrete terms, this would have saved borrowers about $29/month on a $200,000 mortgage.) It's now been suspended over concerns about the amount of money the FHA has on hand.