19 y/o. Facial skin sagging noticeably over few months, increasingly over past few weeks. What's wrong with my face? (photos)

There was a period between Jan-Mar when I got little/no sleep because of school &stress.After, I noticed my skin was visibly sagging under my jaw/cheeks. I got regular sleep by April but I think it's gotten worse. Face rounder, less taut. Cheekbones not as visible. I'm only 19, did not lose/gain weight! Possibly undiagnosed thyroid issue, diabetes, or other illness? I'm so worried; self-esteem has taken plunge. Brow/lid also sagging, developed discoloration around mouth, wounds heal more slowly.

No doctor answers yet