Is it possible to get my labia majora injected with fillers?

Volume enhancement of the labia majora is a common part of labiaplasty and vaginal rejuvenation and can be performed with fillers or your own fat. Deflation is common with aging and typically not associated with weight gain.

Yes, it is possible to have fat grafting to the labia majora to enhance volume and give a more youthful appearance to the vaginal area. It wis difficult to determine if your weight fluctuation as had an effect, but typically it does not.