I lost weight and only my face got thinner, making me look like a skeleton. Is filler the answer?

With summer approaching, I went on a strict diet for two months and lost 5kg! I like that my body is slimmer, but unfortunately, I lost all the fat from my face—especially my front and side cheeks—so I look completely skeletal and aged. Everyone around me says I look tired and tells me to gain some weight, but how can I just put weight back on my face? I'm seriously considering getting fillers or Sculptra for my sunken cheeks, but I'm hesitating because I'm worried about sagging or a severe foreign body sensation afterward. Please let me know how satisfied you are if you've had these procedures done for sunken cheeks like me!