At only 4 weeks post-op you still have a lot of swelling. I wouldn't be so quick to jump to the conclusion that you look worse than you did before the surgery. Many people look very, very different at 6 months post-op than they did at the 4 week mark.
Personally, I don't think your asymmetry in itself at all would warrant another surgery. I believe a study showed that cants less than 4 degrees were unnoticeable by laypeople, and your midline doesn't look that off. That said, it's hard from the pictures you posted to judge the tooth show at rest. Around 3.5mm is very normal in women. Are the bottom of your teeth showing in the third picture? If so, your tooth display doesn't look excessive by any means to me. That said, it's hard to tell from the pictures if your jaws are in a satisfactory position.
Regarding revision, from what I've read, I believe revisions can be performed up to 6 weeks after the first surgery using the original cut. If you wait past that point, you'll probably have to wait 9ish months to get a revision (since the bone has to heal). That said, if you don't completely trust your surgeon, I wouldn't get a revision with him anytime soon. Given all your concerns about the orthodontics, you don't want to rush into a revision, because you're then setting yourself up for a third surgery. I would, however, get a second opinion as soon as you can; if you've expressed your concerns to your surgeon, there's no harm in seeing another and saying "I'm concerned about X, Y, Z... what are your thoughts?"
I really think that if you wait for swelling / soft-tissue to settle there's a chance (not sure how much -- hard to tell with the limited pictures) you'll be happy with the result. If not, lots of people have successfully pursued revision with great results. One particular study showed a vast majority of (the study's author's) patients who underwent a second orthognathic surgery for purely cosmetic reasons were pleased with the outcome. Anecdotally, many seem to find the second recovery easier than the first.
Also, I'm really not convinced you'll need a revision -- I'm just giving you this information for the peace of mind that if you do end up wanting to go down that road, it's completely doable and you're not alone.