Weight loss comes up very often in social media groups.
Here is a helpful link about weight loss/gain.
http://pecanbread.com/p/how/gainweight.html
You can also use this SCD Google Search Engine to read more personal experiences with weight loss/add. SCD Custom Search Engine
To add to that info it is very common for people to under utilize healthy fats. Fats are very calorie dense and you can add them to a lot of vegetables and other dishes.
Examples of healthy fats: Butter, avocados, avocado oil, coconut oil, olive oil, olives, 1/2 and 1/2 yogurt, flax oil, pastured raised animal fats, eggs, nut butters. Adding cheese and DCCC can help too.
But be careful not rush new foods for the sake of gaining weight. Like nut flour baked goods, coconut milk, beans and lentils. Make sure to balance your carbohydrates, proteins and fats.
If you are healing and have energy then don't worry too much about the weight loss. As you heal you will be able to absorb food better and add weight easier. Also use an online BMI calculator to understand how skinny you really are. Here is an example http://www.scientificpsychic.com/fitness/diet.html. Here is a link to a free food journal and calorie counter to confirm you are taking in enough calories per day. http://www.fitday.com/
Most US States running around 30% obesity rates. So we are skinny people living in a fat man's world, everyone thinks we are too skinny. Hang in there and good luck!