How many months does the effect of filler for sunken cheeks usually last?

I went on an extreme diet in a short period of time, and now I've lost all the fat that supports my face.😱 As you can see in the photo, my cheeks and the area around my mouth have sunk deep, making me look lifeless. I've been told I look much older, so I really don't want to look in the mirror anymore. I've been highly recommended filler treatments as the trend for instantly restoring natural volume! Since it involves injecting directly into the face, I'm honestly worried about side effects, but I'm wondering if the results last naturally without feeling foreign. Also, on average, how long does the filler last after just one injection? It would be a waste if it faded quickly, so I'm curious to hear your actual experience with how long it lasts. I'll be waiting for answers from those who have had treatments at Maypure!😆