What can I do to treat my sagging face? (Photo)

I'm 28 yo and lately I noticed that my face suddenly started sagging. I’ve experienced a lot of stress lately and noticed tension in my face and I’ve been clenching my jaw a lot. I think my cheeks sagged, also my eyes became more sunken. My periorbital vein is also very visible. On photo I have weird line, it appears when I'm smiling. I should add that I work in cytostatic laboratory, so I wear mask with filter. What can I do? I looked completely different two weeks ago.