Very insecure about my highly asymmetrical face. What can be done to fix this? (Photo)

Fixing your asymmetry will involve many different parts. First off, this is not caused by side sleeping, but was actually due to your positioning in the uterus before you were born. As for treating this, I would recommend a cheek implant on the right side, to balance it out with the left. Then to contour the jawline down on the lift side, with potentially adding a jawline implant on the right. Might consider a genioplasty as well. We would need some more info and a photo of you smiling to make a better judgement for the lips but improvement can be made there as well. If your nose bothers you, you may consider a rhinoplasty to straighten it out and create more tip definition.