1. Go as quickly as you can. It isn't an emergency, but it is something you should not take lightly.
2. It is not an issue. Even if you had a 179-day gap it is not at a ground of denial for a visa. Just make sure you reveal it. If they ask you if you were out of status which is a part of the form you will say yes. Be truthful.
3. When you want to move and a case is pending unless the pending case is decided you have to go outside for visa stamping. More
Note: This is a verbatim transcript of the referenced audio/video media delivered as oral communication, and, therefore, may not conform to written grammatical or syntactical form.