Hello, and thank you for your medical question on e Health Forum.
From the description it seems that your symptoms are due to chronic constipation, and associated diverticulitis.
There are many things you can help constipation. They include
1. Eating more fruits, vegetables and grains, which are high in fiber
Foods Rich in SOLUBLE Fiber: Oatmeal or oat bran; Brown rice; Orange, grapefruit, green plantain
Foods that can act as laxatives: Prunes, figs, Psyllium husk, shredded wheat, flaxseed (oil), Senna, Cascara sagrada, Aloe vera juice, Dandelion root, Molasses, Liquorice, etc.
2. Drinking plenty of water and other liquids
3. Getting enough exercise, abdominal exercises are best to improve gut motility.
4. Taking time to have a bowel movement when you need to. Visit the toilet for 15 minutes in the morning, even if you are unable to have a bowel movement. This relaxes and stimulates your digestive system.
5. Relaxation and stress management techniques.
6. Proper dietary habits, regular meals, not missing meals and breakfast,etc. Sit quietly for 15 minutes after eating a meal to aid in digestion.
7. Cessation of smoking and tobacco use, excess dependence on sodas, colas and caffiene.
Stomach or intestinal gas is a byproduct generated during the process of digestion. It is generally expelled from the body, either through the mouth (called belching or burping) or through the rectum (flatulence or flatus).
The flatus if smells bad, is due to fermentation process of the colon contents, which generates sulphur gases, which produces that foul odor. This could be due to indigestion or reduced quantity of good bacteria in the gut.
In addition to dietary and lifestyle changes, OTC medications such as activated charcoal, probiotics and digestive enzyme supplements can be used for intestinal or stomach gas relief. Activated charcoal tablets have the best effect in relieving your symptoms.
I hope this helps.