Hello dear, surely will help you.
Better to contact any near by dietician or if not possible contact me. And ask for weight gain diet plan which will Not only increase weight and appetite but cure your vitamins and minerals deficiency.
See,There are many reason of being underweight.
1. Endocrine disturbances
2. Genetic
3. Vitamins and minerals deficiency
4. Psychological problem
5.IBS
6. Eating disorder
7.
Liver dysfunction
And many more
so that we can find the cause of weight reduction , gathering all your data and according ly we will suggest you.
Next Steps
For more information and to contact me directly visit https://www.facebook.com/pg/doctorplanmydiet/about/
Thanks with regards
Dt.Ankita