My overbite is coming back - do I need braces again, a specialised retainer, or surgery? (photos)

From around the age of 13-17 I had braces, which helped with my overbite. I have been wearing a retainer at night since, and am now 22. Over the past few months I have felt changes occur and my over-bite has definitely worsened, I feel that my jaw is becoming noticeably more crooked. I am also aware of how this has impacted my speech slightly, having developed a minor lisp and struggling to pronounce words as clearly as I might have done before. My mouth basically feels like it is shifting...