I would like to help you with your question about swelling in your abdomen.
It is possible that you have a condition called "dysbiosis of the gut". Normally the digestive tract is filled with healthful symbiotic bacteria that help to digest food. Sometimes these healthy bacteria die off and get replaced with pathogenic strains of bacteria, yeast, and parasites.
These types of unhealthy organisms in the gut can lead to bloating and swelling of the intestines.
There are several things that you can do to help yourself.
First, pick up a probiotic supplement at your local vitamin store. One example of an easy-to-find quality product is the supplement called "PB", here is the link:http://www.nutritionnow.com/PB8.htm
Second, you can try taking a digestive enzyme with your meals to help breakdown all of the foodstuff and prevent fermentation. A few examples of quality digestive enzymes include pancreatin, Super Enzyme Caps by Twinlabs, Digest Gold by Enzymedica, and NOW Brand Plant Enzymes.
Third, it is important to limit your intake of sugar and simple carbohydrates. These are the kinds of foods that promote the growth of yeast, parasites, and unhealthy bacteria in the gut.
I hope this helps. Please let me know if you need more information.