What you have is due to the way your infraorbital ligaments attach to the orbital rim. It is very common and easily treated with a filler such as Juvederm Voluma by an expert who understands the anatomy of the area.
From the photos that you have shared it is quite remarkable the difference in the appearance of your face from what I suspect is a few years ago. You are still young and I assume that you have had a great deal of weight loss. Unfortunately, gaining weight does not necessarily insure that it w...
Neck lines can be treated with fillers and smooth threads. if you want a more contoured jawline/neck you would want to do facetite + threads and then long term morpheus treatments every few months.
With significant neck sagging you would need a neck/face lift with muscle tightening...