if this is serious, then yo udefinitely need to change some things, this weight is definitely on the brink of beign unheallthy if it isn't already. Calculate your daily calorie needs and aim for a decent surplus, let's say 400-500 kcal. Try to hit that threshold, but don't dirty bulk. Try to minimize saturated fats and sugar, protein and plant based un saturated fats are your friends.
Some decent foods:
Chicken Breast, Rice, Broccoli, Peas, Oats, Chickpeas, Beef, Eggs, you can also use supplements like protein Powder to meet your Protein goals. You should aim for 1.5g-2g per kg body mass.