Diabetes is often accompanied by a number of other issues, including depression. Where it comes to your nutrition, has your Dr referred you to a qualified Dietitian. She will be able to take into account the Fatty Liver, the Diabetes, etc. as well as your weight. A lot of people have Diabetes, but unfortunately it isn't a one-size-fits-all with what/how much you eat or ratio of fats/carbs/protein, other than exercise and good nutrition.
Sometimes chronic conditions including fatigue can lead to depression. If need be, you can be referred to a Therapist to help you with this.
Where it comes to the GERD, not exercising too soon after a meal is helpful. I used to notice that when I had eaten a meal, even if I put my newspaper on the floor and leaned over in my armchair to read it, I suffered big-time. It took a long time to twig that bending over like that was the problem. GERD in itself should affect what you can do physically rather than just the timing.
Below are some links that you may find helpful : www.mayoclinic.com/health/nonalcoholic-fat
Good luck and take care,