How to gain healthy weight asap with very very low budget? I got extremely thin (BMI 15)

I am living in poverty for the last 3-4 years and this year with the inflation in the country I am in it is impossible to afford basic food. I am trying to find a full time job but quite possibly face a lot of discrimination as a migrant. My visa also restricts the types of jobs that I can do.

My BMI is 15 something and is extremely low as a woman. I have also been dealing with severe & chronic depression, health issues and social isolation. I used to be somewhat good looking but now I look like straight out of a zombie movie, which really really hurts me to see in the mirror. I got rejected in so many job interviews. It might very well have sth to do with how unhealthy I look. How can I gain healthy fat (especially face fat) to look at least more hireable? Clothing tricks are also welcome. (I cannot afford makeup products.)