You are not the only A to have that problem (though mine is the opposite).

You can still eat rice, and bread if it is 100 percent rye or spelt. Plus lentils and some types of legumes. Amaranth and quinoa are also calorically dense. And make sure to get your good fats (ghee, olive oil, walnut oil). You can have some ricotta, mozarella and yogurt.

I have eczema due to toxins in my body, It might help you to do a clense. You also might be allergic or intolorate to foods which would be helped by clensing. Also I just started reading a book called "your body's many cries for water" by F.Batmanghelidij,M.D he claims that eczema is a symptom of dehydration. I find most his claims very logical I suggest you to take a look at it. There is 1 other possibility it may be due to personal care products like soaps,shampoo with chemicals,also clorine water is very bad even to shower in maybe try a shower filter to remove the chorine. I hope this helps you