Fatty liver, weight problems fast food diet: this suggests diabetes or pre-diabetes. I suggest you google "insulin leptin and blood Sugar why diabetic medications fail" and "blood Sugar 101"
a book called "fiber menace" helped me with constipation. HCL and plant enzymes cured my constipation in january after 5 years of chronic costipaption.
I would get a stool test and allergy panel just to help shed some more light on what you might be up against.