diddass:Will me acting obnoxious toward them and not letting them in my house give them a reason to come back tommorow with a search/arrest warrant?
The only answer to that is possibly. Without knowing why they were looking for the person in the photo and what other evidence they have there is no way to predict whether they will return or not.
diddass:What do I do from here?
If it were me I would at least make a phone call to a criminal defense attorney or two and ask their advice on that question. That way if the Secret Service does insist on questioning you, you already have a head start on securing counsel for that event.
diddass:He said what do you need a lawyer for?
A typical question meant to goad a potential suspect into "unburdening" themselves and to continue to talk. Smart move on your part telling them no more discussion without a lawyer. If they do indeed return what ever attorney you hire will LOVE you for not having diarrhea of the mouth and having to mitigate any dammage caused by it.
"That's just my opinion, then again I might be wrong." Dennis Miller