You need to look at food combining on google and find good sources and diagrams that will tell you what things you can eat at the same time, in a same meal.
Melon and nuts should always be consumed by themselves as a mono meal. You may be allergic to chickpeas. Also check out Elimination Diet.
You are hungry at 4pm, so eat only at 4pm. Fresh mint tea is great for you.
If you are unable to focus is also from severe dehydration. Make sure to stay away from all caffeinated products including chocolate.
When are all better, think about doing a liver flush.